Playing around before watching Tom Scott's video about writing on 7-segment displays.
Having watched the full video, I took a slightly different character set (allowed G, disallowed S and Y for being ambiguous with 5 and 4) and came up with a slightly longer word at 25 characters.
Oh... and I spent far too long messing around getting words to be printable before actually checking anything! Ironically (see here), there don't seem to be any emoji or unicode symbols to represent 7-segment displays.
It's not as readable without the fancy graphics but see if you can work it out... Answer at the bottom of src/main.ts if you can't.
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Word list from https://github.com/dwyl/english-words