jolly vs merry

jolly is a noun but merry is not a noun.

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

As adjectives, jolly and merry are synonyms defined as:

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

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

jolly (adjective)	merry (adjective)
full of or showing high-spirited merriment	quick and energetic
	offering fun and gaiety
	full of or showing high-spirited merriment

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

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