friendlessness vs solitariness

friendlessness and solitariness both are nouns.

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

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

Other hypernyms of friendlessness include aloneness, loneliness, lonesomeness.

friendlessness (noun)	solitariness (noun)
being without friends	a disposition toward being alone
	the state of being alone in solitary isolation