Note: these 'words' (valid or invalid) are all the permutations of the word yes. These words are obtained by scrambling the letters in yes.
Definitions and meaning of yes
From Middle Englishyes, from Old Englishġīese. Compare yea.
Used to show agreement or acceptance.
2016, VOA Learning English (public domain)
Hi, Jonathan. Are you busy? — Yes, I’m busy.
Used to indicate disagreement or dissent in reply to a negative statement.
Answer to a question presuming one answer when all answers are correct.
An exclamation of pleasure or approval, usually transcribed with an exclamation point.
In Old and Middle English, yes was a more forceful affirmative than yea.
An example of yes used to disagree with a statement: the questions "You don’t want it, do you?" and "Don’t you want it?" are answered by "yes" if the respondent does want the item, and "no" if not. Many languages use a specific word for this purpose; see translation table below.
Dialect or archaic forms: arr, ay, aye, yea, yassuh