lonesomeness vs temperament

lonesomeness and temperament both are nouns.

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

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

Other hypernyms of lonesomeness include disposition.

lonesomeness (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
	your usual mood
	excessive emotionalism or irritability and excitability (especially when displayed openly)