inhabitation vs inhabitancy

inhabitation and inhabitancy both are nouns.

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

As nouns, inhabitation and inhabitancy are synonyms defined as:

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

Other synonyms of inhabitation include habitation.

inhabitation (noun)	inhabitancy (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)