solitariness vs temperament

solitariness and temperament both are nouns.

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

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

Other hypernyms of solitariness include disposition.

solitariness (noun)	temperament (noun)
a disposition toward being alone	an adjustment of the intervals (as in tuning a keyboard instrument) so that the scale can be used to play in different keys
the state of being alone in solitary isolation	your usual mood
	excessive emotionalism or irritability and excitability (especially when displayed openly)