It appears as if there are plurals in the words you can use to guess. I just tried PILLS and it worked. I have not yet run across a plural as the answer but I haven't looked at the word list.
Re:Show HN: Wordle over DNS
by sprobertson on Saturday February 19, 2022 @05:34PM
(#30401171)
1.6% of possible answers end with "s" but none of those are plural. 30.5% of allowed guesses end in "s" however.
There's no reason it has to be noticeably disproportionate, the clues are curated and not just picked randomly from the list of words that are legal to guess.
I guess I'm also curious if the suggestion is that all these words are illegal to guess or just not used as clues?