indictment vs legal instrument

indictment and legal instrument both are nouns.

Word	Noun	Adjective	Verb	Adverb
indictment	Yes	No	No	No
legal instrument	Yes	No	No	No

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

indictment: a formal document written for a prosecuting attorney charging a person with some offense
legal instrument: (law) a document that states some contractual relationship or grants some right

Other hypernyms of indictment include instrument, legal document, official document.

indictment (noun)	legal instrument (noun)
a formal document written for a prosecuting attorney charging a person with some offense	(law) a document that states some contractual relationship or grants some right
an accusation of wrongdoing