good humour vs amiability

good humour and amiability both are nouns.

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

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

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

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