temper vs good humour

temper and good humour both are nouns.

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

As nouns, good humour is a hyponym of temper; that is, good humour is a word with a more specific, narrower meaning than temper:

temper: a characteristic (habitual or relatively temporary) state of feeling
good humour: a cheerful and agreeable mood

Other hyponyms of temper include peeve, sulk, sulkiness, amiability, good humor, good temper, distemper, ill humor, ill humour.

temper (noun)	good humour (noun)
the elasticity and hardness of a metal object; its ability to absorb considerable energy before cracking	a cheerful and agreeable mood
a disposition to exhibit uncontrolled anger
a characteristic (habitual or relatively temporary) state of feeling
a sudden outburst of anger

temper (verb)	good humour (verb)
make more temperate, acceptable, or suitable by adding something else
adjust the pitch (of pianos)
harden by reheating and cooling in oil
change by restraining or moderating
bring to a desired consistency, texture, or hardness by a process of gradually heating and cooling