propinquity vs closeness

propinquity and closeness both are nouns.

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

As nouns, closeness is a hypernym of propinquity; that is, closeness is a word with a broader meaning than propinquity:

Other hypernyms of propinquity include nearness.

propinquity (noun)	closeness (noun)
the property of being close together	the spatial property resulting from a relatively small distance
	characterized by a lack of openness (especially about one's actions or purposes)
	the quality of being close and poorly ventilated
	close or warm friendship
	extreme stinginess
	a feeling of being intimate and belonging together