occupancy vs residency

occupancy and residency both are nouns.

Word	Noun	Adjective	Verb	Adverb
occupancy	Yes	No	No	No
residency	Yes	No	No	No

As nouns, residency is a hypernym of occupancy; that is, residency is a word with a broader meaning than occupancy:

Other hypernyms of occupancy include abidance, residence.

occupancy (noun)	residency (noun)
an act of being a tenant or occupant	the act of dwelling in a place
the act of occupying or taking possession of a building	the position of physician who is receiving special training in a hospital (usually after completing an internship)