good humor vs humor

good humor and humor both are nouns.

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

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

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

good humor (noun)	humor (noun)
a cheerful and agreeable mood	the quality of being funny
	the trait of appreciating (and being able to express) the humorous
	the liquid parts of the body
	(Middle Ages) one of the four fluids in the body whose balance was believed to determine your emotional and physical state
	a message whose ingenuity or verbal skill or incongruity has the power to evoke laughter
	a characteristic (habitual or relatively temporary) state of feeling

good humor (verb)	humor (verb)
	put into a good mood