good humor vs mood

good humor and mood both are nouns.

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

As nouns, mood is a hypernym of good humor; that is, mood is a word with a broader meaning than good humor:

Other hypernyms of good humor include humor, humour, temper.

good humor (noun)	mood (noun)
a cheerful and agreeable mood	a characteristic (habitual or relatively temporary) state of feeling
	verb inflections that express how the action or state is conceived by the speaker
	the prevailing psychological state