@kdfrawg The question came to me when I read about the construction that allows for verbs to be derived from adjectives by suffixing -en (e.g. wide -> widen). I was trying to think, in terms of regex, how one might find a list of all of these verbs in a corpus, given a complete list of adjectives in English. At some point in that thought process, I realised that I was struggling to find adjectives ending in vowels other than y or e.
I don't particularly see the immediate significance of such a question, but I guess that's the general way of things in academia — the dictionary-grammar model wasn't questioned all that much until people like the construction grammarians came along and (in some cases, literally) turned that concept on its head.