optimism vs temperament

optimism and temperament both are nouns.

Word	Noun	Adjective	Verb	Adverb
optimism	Yes	No	No	No
temperament	Yes	No	No	No

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

Other hypernyms of optimism include disposition.

optimism (noun)	temperament (noun)
a general disposition to expect the best in all things	an adjustment of the intervals (as in tuning a keyboard instrument) so that the scale can be used to play in different keys
the optimistic feeling that all is going to turn out well	your usual mood
	excessive emotionalism or irritability and excitability (especially when displayed openly)