good nature vs temperament

good nature and temperament both are nouns.

Word	Noun	Adjective	Verb	Adverb
good nature	Yes	No	No	No
temperament	Yes	No	No	No

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

Other hypernyms of good nature include disposition.

good nature (noun)	temperament (noun)
a cheerful, obliging disposition	an adjustment of the intervals (as in tuning a keyboard instrument) so that the scale can be used to play in different keys
	your usual mood
	excessive emotionalism or irritability and excitability (especially when displayed openly)