Synonyms for Inmate (same or very similar meaning)
WordNet sense 1 (a patient who is residing in the hospital where he is being treated):
inpatientWordNet sense 2 (a person serving a sentence in a jail or prison):
con, convict, jailbird, yardbird, gaolbird, convict, jail bird, yard birdFrom the ODE community, based on WordNetadd/edit