receptivity vs receptive

receptivity is a noun but receptive is not a noun.

Word	Noun	Adjective	Verb	Adverb
receptivity	Yes	No	No	No
receptive	No	Yes	No	No

receptivity (noun)	receptive (noun)
willingness or readiness to receive (especially impressions or ideas)

receptivity (adjective)	receptive (adjective)
	ready or willing to receive favorably
	able to absorb liquid (not repellent)
	of a nerve fiber or impulse originating outside and passing toward the central nervous system
	open to arguments, ideas, or change