indictment vs true bill

indictment and true bill both are nouns.

Word	Noun	Adjective	Verb	Adverb
indictment	Yes	No	No	No
true bill	Yes	No	No	No

As nouns, true bill is a hyponym of indictment; that is, true bill is a word with a more specific, narrower meaning than indictment:

indictment: a formal document written for a prosecuting attorney charging a person with some offense
true bill: an indictment endorsed by a grand jury

Other hyponyms of indictment include murder charge, murder indictment.

indictment (noun)	true bill (noun)
a formal document written for a prosecuting attorney charging a person with some offense	an indictment endorsed by a grand jury
an accusation of wrongdoing