proximal vs proximity

proximal is not a noun while proximity is a noun.

Word	Noun	Adjective	Verb	Adverb
proximal	No	Yes	No	No
proximity	Yes	No	No	No

proximal (noun)	proximity (noun)
	the property of being close together
	a Gestalt principle of organization holding that (other things being equal) objects or events that are near to one another (in space or time) are perceived as belonging together as a unit
	the region close around a person or thing

proximal (adjective)	proximity (adjective)
situated nearest to point of attachment or origin