loneliness vs aloneness

loneliness and aloneness both are nouns.

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

As nouns, loneliness and aloneness are synonyms defined as:

Other synonyms of loneliness include lonesomeness, solitariness.

loneliness (noun)	aloneness (noun)
a disposition toward being alone	a disposition toward being alone
sadness resulting from being forsaken or abandoned
the state of being alone in solitary isolation