subjective vs subjectivity

subjective is not a noun while subjectivity is a noun.

Word	Noun	Adjective	Verb	Adverb
subjective	No	Yes	No	No
subjectivity	Yes	No	No	No

subjective (noun)	subjectivity (noun)
	judgment based on individual personal impressions and feelings and opinions rather than external facts

subjective (adjective)	subjectivity (adjective)
taking place within the mind and modified by individual bias
of a mental act performed entirely within the mind