solitariness vs aloneness

solitariness and aloneness both are nouns.

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

As nouns, solitariness and aloneness are synonyms defined as:

Other synonyms of solitariness include loneliness, lonesomeness.

solitariness (noun)	aloneness (noun)
a disposition toward being alone	a disposition toward being alone
the state of being alone in solitary isolation