loneliness vs temperament

loneliness and temperament both are nouns.

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

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

Other hypernyms of loneliness include disposition.

loneliness (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
sadness resulting from being forsaken or abandoned	your usual mood
the state of being alone in solitary isolation	excessive emotionalism or irritability and excitability (especially when displayed openly)