diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..459a3da
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,74 @@
+name: CI
+on:
+  push:
+  pull_request:
+
+jobs:
+  tests:
+    strategy:
+      matrix:
+        # os: [ubuntu-latest, windows-latest]
+        os: [ubuntu-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v3
+      - name: Install Neovim
+        shell: bash
+        run: |
+          mkdir -p /tmp/nvim
+          wget -q https://github.com/neovim/neovim/releases/download/nightly/nvim.appimage -O /tmp/nvim/nvim.appimage
+          cd /tmp/nvim
+          chmod a+x ./nvim.appimage
+          ./nvim.appimage --appimage-extract
+          echo "/tmp/nvim/squashfs-root/usr/bin/" >> $GITHUB_PATH
+      - name: Run Tests
+        run: |
+          nvim --version
+          [ ! -d tests ] && exit 0
+          nvim --headless -u tests/init.lua -c "PlenaryBustedDirectory tests/ {minimal_init = 'tests/init.lua', sequential = true}"
+  docs:
+    runs-on: ubuntu-latest
+    needs: tests
+    if: ${{ github.ref == 'refs/heads/master' }}
+    steps:
+      - uses: actions/checkout@v3
+      - name: panvimdoc
+        uses: kdheepak/panvimdoc@main
+        with:
+          vimdoc: word.nvim
+          version: "Neovim >= 0.8.0"
+          demojify: true
+          treesitter: true
+      - name: Push changes
+        uses: stefanzweifel/git-auto-commit-action@v4
+        with:
+          commit_message: "chore(build): auto-generate vimdoc"
+          commit_user_name: "github-actions[bot]"
+          commit_user_email: "github-actions[bot]@users.noreply.github.com"
+          commit_author: "github-actions[bot] <github-actions[bot]@users.noreply.github.com>"
+  release:
+    name: release
+    if: ${{ github.ref == 'refs/heads/master' }}
+    needs:
+      - docs
+      - tests
+    runs-on: ubuntu-latest
+    steps:
+      - uses: google-github-actions/release-please-action@v3
+        id: release
+        with:
+          release-type: simple
+          package-name: word.nvim
+          extra-files: |
+            lua/lazy/core/config.lua
+      - uses: actions/checkout@v3
+      - name: tag stable versions
+        if: ${{ steps.release.outputs.release_created }}
+        run: |
+          git config user.name github-actions[bot]
+          git config user.email github-actions[bot]@users.noreply.github.com
+          git remote add gh-token "https://${{ secrets.GITHUB_TOKEN }}@github.com/google-github-actions/release-please-action.git"
+          git tag -d stable || true
+          git push origin :stable || true
+          git tag -a stable -m "Last Stable Release"
+          git push origin stable
diff --git a/.luarc.jsonc b/.luarc.jsonc
new file mode 100644
index 0000000..3f53162
--- /dev/null
+++ b/.luarc.jsonc
@@ -0,0 +1,16 @@
+{
+  "$schema": "https://raw.githubusercontent.com/LuaLS/vscode-lua/master/setting/schema.json",
+  "runtime": {
+    "version": "LuaJIT"
+  },
+  "workspace": {
+    "library": [
+      "runtime/lua",
+      "${3rd}/luv/library"
+    ],
+    "ignoreDir": [
+      "test"
+    ],
+    "checkThirdParty": "Disable"
+  }
+}
diff --git a/.stylua.toml b/.stylua.toml
new file mode 100644
index 0000000..22d6d3e
--- /dev/null
+++ b/.stylua.toml
@@ -0,0 +1,6 @@
+column_width = 100
+line_endings = "Unix"
+indent_type = "Spaces"
+indent_width = 2
+quote_style = "AutoPreferSingle"
+call_parentheses = "Input"
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..2212a7a
--- /dev/null
+++ b/README.md
@@ -0,0 +1 @@
+## WIP
diff --git a/doc/word.nvim.txt b/doc/word.nvim.txt
new file mode 100644
index 0000000..e69de29
diff --git a/lua/word/commands.lua b/lua/word/commands.lua
new file mode 100644
index 0000000..1c0c612
--- /dev/null
+++ b/lua/word/commands.lua
@@ -0,0 +1,3 @@
+return {
+  ui_launch = function() require('word.ui').launch() end,
+}
diff --git a/lua/word/config.lua b/lua/word/config.lua
new file mode 100644
index 0000000..7663b18
--- /dev/null
+++ b/lua/word/config.lua
@@ -0,0 +1,5 @@
+local default_opts = {}
+
+return {
+  setup = function(opts) end,
+}
diff --git a/lua/word/init.lua b/lua/word/init.lua
new file mode 100644
index 0000000..be70609
--- /dev/null
+++ b/lua/word/init.lua
@@ -0,0 +1,11 @@
+local M = {}
+
+M.setup = function(opts)
+  require('word.config').setup(opts)
+end
+
+return setmetatable(M, {
+  __index = function(_, k)
+    return require('word.commands')[k]
+  end,
+})
diff --git a/lua/word/menu.lua b/lua/word/menu.lua
new file mode 100644
index 0000000..452ee35
--- /dev/null
+++ b/lua/word/menu.lua
@@ -0,0 +1,47 @@
+local Menu = require('nui.menu')
+local event = require('nui.utils.autocmd').event
+local Layout = require('nui.layout')
+
+local menu = Menu({
+  position = '50%',
+  size = { width = '50%', height = '60%' },
+  border = {
+    style = 'single',
+    text = { top = '[Choose-an-Element]', top_align = 'center' },
+  },
+  win_options = {
+    winhighlight = 'Normal:Normal,FloatBorder:Normal',
+  },
+}, {
+  lines = {
+    Menu.item('Hydrogen (H)'),
+    Menu.item('Carbon (C)'),
+    Menu.item('Nitrogen (N)'),
+    Menu.separator('Noble-Gases', { char = '-', text_align = 'right' }),
+    Menu.item('Helium (He)'),
+    Menu.item('Neon (Ne)'),
+    Menu.item('Argon (Ar)'),
+  },
+  max_width = 20,
+  keymap = {
+    focus_next = { 'j', '<Down>', '<Tab>' },
+    focus_prev = { 'k', '<Up>', '<S-Tab>' },
+    close = { '<Esc>', '<C-c>' },
+    submit = { '<CR>', '<Space>' },
+  },
+  on_close = function()
+    print('Menu Closed!')
+  end,
+  on_submit = function(item)
+    print('Menu Submitted: ', item.text)
+  end,
+})
+
+local layout = Layout(
+  { position = '50%', size = { width = 80, height = '60%' } },
+  Layout.Box({
+    Layout.Box(menu, { size = '60%' }),
+  }, { dir = 'col' })
+)
+
+layout:mount()
diff --git a/lua/word/ui.lua b/lua/word/ui.lua
new file mode 100644
index 0000000..5d2f3d0
--- /dev/null
+++ b/lua/word/ui.lua
@@ -0,0 +1,91 @@
+local Popup = require('nui.popup')
+local event = require('nui.utils.autocmd').event
+local Layout = require('nui.layout')
+local NuiLine = require('nui.line')
+
+local Util = require('word.util')
+
+local cet6_json_path = '~/cet.json'
+local bookmark_json_path = '~/cet-bookmark.json'
+
+local dict = vim.json.decode(Util.read_file(cet6_json_path))
+local words = vim.tbl_keys(dict)
+table.sort(words, function(a, b)
+  return a:lower() < b:lower()
+end)
+
+local popup = Popup({
+  enter = true,
+  focusable = true,
+  border = { style = 'rounded' },
+  position = '50%',
+  size = { width = '50%', height = '60%' },
+})
+
+local layout = Layout(
+  {
+    position = '50%',
+    size = { width = '50%', height = '60%' },
+  },
+  Layout.Box({
+    Layout.Box(popup, { size = '100%' }),
+  }, { dir = 'row' })
+)
+
+local toggle_ed = {}
+
+local buf_update = function(bufnr, line_nr)
+  for i = 1, #words do
+    local word = words[i]
+    local line = NuiLine()
+
+    local sig = toggle_ed[i] and 'x' or ' '
+    if line_nr == i then
+      line:append(('[%s]\t'):format(sig), 'Error')
+    else
+      line:append(('[%s]\t'):format(sig), 'Error')
+    end
+    line:append(('%-16s'):format(word), 'Function')
+    line:append('\t')
+    line:append(('%s'):format(dict[word]), 'String')
+    line:render(bufnr, -1, i)
+  end
+end
+
+local keymap_setup = function()
+  popup:map('n', 'm', function()
+    local line_nr = vim.fn.line '.'
+    if toggle_ed[line_nr] then
+      toggle_ed[line_nr] = nil
+    else
+      toggle_ed[line_nr] = true
+    end
+    buf_update(popup.bufnr, line_nr)
+  end)
+  -- update bookmark
+  popup:map('n', 'w', function()
+    local save = {}
+    for i in pairs(toggle_ed) do
+      table.insert(save, words[i])
+    end
+    local data = vim.json.encode(save)
+    Util.write_file(bookmark_json_path, data)
+  end)
+  -- show words' detail
+  -- popup:map('n', 'o', show_detail())
+end
+
+local launch = function()
+  layout:mount()
+  popup:on(event.BufLeave, function()
+    popup:unmount()
+  end)
+  keymap_setup()
+  buf_update(popup.bufnr)
+end
+
+launch()
+
+return {
+  launch = launch,
+}
diff --git a/lua/word/util.lua b/lua/word/util.lua
new file mode 100644
index 0000000..7e4096e
--- /dev/null
+++ b/lua/word/util.lua
@@ -0,0 +1,26 @@
+local M = {}
+
+M.read_file = function(path)
+  path = vim.fs.normalize(path)
+  local fd = assert(io.open(path, 'r'))
+  if fd == nil then
+    vim.notify('fail to open file', vim.log.levels.ERROR, { title = 'word.nvim' })
+    return
+  end
+  ---@type string
+  local data = fd:read('*a')
+  fd:close()
+  return data
+end
+
+M.write_file = function(path, data)
+  path = vim.fs.normalize(path)
+  local fd = assert(io.open(path, 'w'))
+  if fd == nil then
+    vim.notify('fail to open file', vim.log.levels.ERROR, { title = 'word.nvim' })
+    return
+  end
+  fd:write(data)
+  fd:close()
+end
+return M