severalty vs separateness

severalty and separateness both are nouns.

Word	Noun	Adjective	Verb	Adverb
severalty	Yes	No	No	No
separateness	Yes	No	No	No

As nouns, severalty and separateness are synonyms defined as:

Other synonyms of severalty include discreteness, distinctness.

severalty (noun)	separateness (noun)
exclusive individual ownership	the quality of being not alike; being distinct or different from that otherwise experienced or known
the state of being several and distinct	political independence
	the state of being several and distinct