indictment vs accusation

indictment and accusation both are nouns.

Word	Noun	Adjective	Verb	Adverb
indictment	Yes	No	No	No
accusation	Yes	No	No	No

As nouns, accusation is a hypernym of indictment; that is, accusation is a word with a broader meaning than indictment:

indictment: an accusation of wrongdoing
accusation: a formal charge of wrongdoing brought against a person; the act of imputing blame or guilt

Other hypernyms of indictment include accusal.

indictment (noun)	accusation (noun)
a formal document written for a prosecuting attorney charging a person with some offense	a formal charge of wrongdoing brought against a person; the act of imputing blame or guilt
an accusation of wrongdoing	an assertion that someone is guilty of a fault or offence