inmate vs yardbird

inmate and yardbird both are nouns.

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

As nouns, inmate and yardbird are synonyms defined as:

Other synonyms of inmate include con, convict, yard bird.

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