How to add custom autocomplete in Google Sheets?

I have a spreadsheet which is a dictionary mapping fantasy words to english definitions/words. I would like to be able to type the english word and get a list of matching fantasy words, when typing into a cell. How can I accomplish that in Google Spreadsheets, perhaps using an app script somehow? Is it possible?

For example, given this:

foo,devicebar,deviousbaz,phone

If I search "dev" it should show "foo" and "bar", or if I search "ph" it shows "baz", in an autocomplete list. Is anything like this possible in Google Sheets? It would help so much in mapping English words to fantasy words, I could simply type the English meaning and get the fantasy word, without having to go back to the fantasy sheet, CMD+F find the English word, then copy/paste the corresponding fantasy word back into the other sheet.