unity vs unitariness

unity and unitariness both are nouns.

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

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

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

Other hyponyms of unity include completeness, incompleteness, rawness.

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