identity vs oneness

identity and oneness both are nouns.

Word	Noun	Adjective	Verb	Adverb
identity	Yes	No	No	No
oneness	Yes	No	No	No

As nouns, oneness is a hyponym of identity; that is, oneness is a word with a more specific, narrower meaning than identity:

Other hyponyms of identity include unity, selfsameness.

identity (noun)	oneness (noun)
the distinct personality of an individual regarded as a persisting entity	the quality of being united into one
exact sameness
the individual characteristics by which a thing or person is recognized or known
an operator that leaves unchanged the element on which it operates