solitariness vs disposition

solitariness and disposition both are nouns.

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

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

Other hypernyms of solitariness include temperament.

solitariness (noun)	disposition (noun)
a disposition toward being alone	the act or means of getting rid of something
the state of being alone in solitary isolation	your usual mood
	a natural or acquired habit or characteristic tendency in a person or thing
	an attitude of mind especially one that favors one alternative over others