distinctness vs distinct

distinctness is a noun but distinct is not a noun.

Word	Noun	Adjective	Verb	Adverb
distinctness	Yes	No	No	No
distinct	No	Yes	No	No

distinctness (noun)	distinct (noun)
the quality of being sharp and clear
the quality of being not alike; being distinct or different from that otherwise experienced or known
the state of being several and distinct

distinctness (adjective)	distinct (adjective)
	easy to perceive; especially clearly outlined
	clearly or sharply defined to the mind
	recognizable; marked
	(often followed by `from') not alike; different in nature or quality
	constituting a separate entity or part