inmate vs inpatient

inmate and inpatient both are nouns.

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

As nouns, inmate and inpatient are synonyms defined as:

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

inmate (noun)	inpatient (noun)
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 patient who is residing in the hospital where he is being treated
a person serving a sentence in a jail or prison