resident vs residency

resident and residency both are nouns.

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

resident (noun)	residency (noun)
someone who lives at a particular place for a prolonged period or who was born there	the act of dwelling in a place
a physician (especially an intern) who lives in a hospital and cares for hospitalized patients under the supervision of the medical staff of the hospital	the position of physician who is receiving special training in a hospital (usually after completing an internship)

resident (adjective)	residency (adjective)
living in a particular place
used of animals that do not migrate