good humor vs joviality

good humor and joviality both are nouns.

Word	Noun	Adjective	Verb	Adverb
good humor	Yes	No	No	No
joviality	Yes	No	No	No

As nouns, joviality is a hyponym of good humor; that is, joviality is a word with a more specific, narrower meaning than good humor:

Other hyponyms of good humor include jolliness, jollity.

good humor (noun)	joviality (noun)
a cheerful and agreeable mood	a jovial nature
	feeling jolly and jovial and full of good humor