proximity vs propinquity

proximity and propinquity both are nouns.

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

As nouns, proximity and propinquity are synonyms defined as:

proximity (noun)	propinquity (noun)
the property of being close together	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