unique vs uniqueness

unique is not a noun while uniqueness is a noun.

Word	Noun	Adjective	Verb	Adverb
unique	No	Yes	No	No
uniqueness	Yes	No	No	No

unique (noun)	uniqueness (noun)
	the quality of being one of a kind

unique (adjective)	uniqueness (adjective)
radically distinctive and without equal
the single one of its kind
(followed by `to') applying exclusively to a given category or condition or locality
highly unusual or rare but not the single instance