separateness vs otherness

separateness and otherness both are nouns.

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

As nouns, separateness and otherness are synonyms defined as:

separateness and otherness: the quality of being not alike; being distinct or different from that otherwise experienced or known

Other synonyms of separateness include distinctness.

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