mirthful vs jolly

mirthful is not a noun while jolly is a noun.

Word	Noun	Adjective	Verb	Adverb
mirthful	No	Yes	No	No
jolly	Yes	Yes	Yes	Yes

As adjectives, mirthful and jolly are synonyms defined as:

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

mirthful (noun)	jolly (noun)
	a yawl used by a ship's sailors for general work
	a happy party

mirthful (adjective)	jolly (adjective)
arousing or provoking laughter	full of or showing high-spirited merriment
full of or showing high-spirited merriment

mirthful (verb)	jolly (verb)
	be silly or tease one another

mirthful (adverb)	jolly (adverb)
	to certain extent or degree