festive vs gay

festive is not a noun while gay is a noun.

Word	Noun	Adjective	Verb	Adverb
festive	No	Yes	No	No
gay	Yes	Yes	No	No

As adjectives, festive and gay are synonyms defined as:

Other synonyms of festive include festal, merry.

festive (noun)	gay (noun)
	someone who is sexually attracted to persons of the same sex

festive (adjective)	gay (adjective)
offering fun and gaiety	bright and pleasant; promoting a feeling of cheer
	brightly colored and showy
	homosexual or arousing homosexual desires
	given to social pleasures often including dissipation
	offering fun and gaiety
	full of or showing high-spirited merriment