yay- exclamation of approval, cheer
Yay! My team won.
yea- affirmative response usually only used when voting, sounds like “yay”
How do you vote? I vote “yea”. (so like yea or nay)
Yeah, I got my homework done.
This gets confusing because “yay” and “yea” sound the same but have different meanings.
So that's my lesson for the day.