good humour vs mood

good humour and mood both are nouns.

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

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

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

good humour (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