good humor vs amiability

good humor and amiability both are nouns.

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

As nouns, good humor and amiability are synonyms defined as:

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

good humor (noun)	amiability (noun)
a cheerful and agreeable mood	a disposition to be friendly and approachable (easy to talk to)
	a cheerful and agreeable mood