yardbird vs trusty

yardbird and trusty both are nouns.

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

As nouns, trusty is a hyponym of yardbird; that is, trusty is a word with a more specific, narrower meaning than yardbird:

yardbird: a person serving a sentence in a jail or prison
trusty: a convict who is considered trustworthy and granted special privileges

Other hyponyms of yardbird include lifer.

yardbird (noun)	trusty (noun)
a military recruit who is assigned menial tasks	a convict who is considered trustworthy and granted special privileges
a person serving a sentence in a jail or prison

yardbird (adjective)	trusty (adjective)
	worthy of trust or belief