inpatient vs inmate

inpatient and inmate both are nouns.

Word	Noun	Adjective	Verb	Adverb
inpatient	Yes	No	No	No
inmate	Yes	No	No	No

As nouns, inpatient and inmate are synonyms defined as:

inpatient and inmate: a patient who is residing in the hospital where he is being treated

inpatient (noun)	inmate (noun)
a patient who is residing in the hospital where he is being treated	one of several resident of a dwelling (especially someone confined to a prison or hospital)
	a patient who is residing in the hospital where he is being treated
	a person serving a sentence in a jail or prison