nervousness vs temperament

nervousness and temperament both are nouns.

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

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

Other hypernyms of nervousness include disposition.

nervousness (noun)	temperament (noun)
a sensitive or highly strung temperament	an adjustment of the intervals (as in tuning a keyboard instrument) so that the scale can be used to play in different keys
the anxious feeling you have when you have the jitters	your usual mood
an uneasy psychological state	excessive emotionalism or irritability and excitability (especially when displayed openly)