inhabitancy vs habitation

inhabitancy and habitation both are nouns.

Word	Noun	Adjective	Verb	Adverb
inhabitancy	Yes	No	No	No
habitation	Yes	No	No	No

As nouns, inhabitancy and habitation are synonyms defined as:

inhabitancy and habitation: the act of dwelling in or living permanently in a place (said of both animals and men)

Other synonyms of inhabitancy include inhabitation.

inhabitancy (noun)	habitation (noun)
the act of dwelling in or living permanently in a place (said of both animals and men)	the act of dwelling in or living permanently in a place (said of both animals and men)
	housing that someone is living in
	the native habitat or home of an animal or plant