unitariness vs unity

unitariness and unity both are nouns.

Word	Noun	Adjective	Verb	Adverb
unitariness	Yes	No	No	No
unity	Yes	No	No	No

As nouns, unity is a hypernym of unitariness; that is, unity is a word with a broader meaning than unitariness:

unitariness: The quality or state of pertaining to a unit, having the quality of oneness.
unity: an undivided or unbroken completeness or totality with nothing wanting

Other hypernyms of unitariness include integrity, wholeness.

unitariness (noun)	unity (noun)
The quality or state of pertaining to a unit, having the quality of oneness.	the quality of being united into one
	the smallest whole number or a numeral representing this number
	an undivided or unbroken completeness or totality with nothing wanting