Is “Yay” a Scrabble word?
Yes
YAY
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Yay
/jeɪ/
interjection
1.An expression of happiness.
“Yay! I have finally finished my work!”
Synonyms: hooray
adverb
1.Yes.
2.Thus, so (now often accompanied by a hand gesture).
“The pony was yea high.”
Synonyms: aye, yeah, yep, yes, yigh, yup