gay vs jovial

gay is a noun but jovial is not a noun.

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

As adjectives, gay and jovial are synonyms defined as:

Other synonyms of gay include jocund, jolly, merry, mirthful.

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

gay (adjective)	jovial (adjective)
bright and pleasant; promoting a feeling of cheer	full of or showing high-spirited merriment
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