inhabitancy vs tenancy

inhabitancy and tenancy both are nouns.

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

As nouns, tenancy is a hypernym of inhabitancy; that is, tenancy is a word with a broader meaning than inhabitancy:

inhabitancy: the act of dwelling in or living permanently in a place (said of both animals and men)
tenancy: an act of being a tenant or occupant

Other hypernyms of inhabitancy include occupancy.

inhabitancy (noun)	tenancy (noun)
the act of dwelling in or living permanently in a place (said of both animals and men)	an act of being a tenant or occupant