gay vs jocund

gay is a noun but jocund is not a noun.

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

As adjectives, gay and jocund are synonyms defined as:

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

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

gay (adjective)	jocund (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