impeachment vs legal document

impeachment and legal document both are nouns.

Word	Noun	Adjective	Verb	Adverb
impeachment	Yes	No	No	No
legal document	Yes	No	No	No

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

impeachment: a formal document charging a public official with misconduct in office
legal document: (law) a document that states some contractual relationship or grants some right

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

impeachment (noun)	legal document (noun)
a formal document charging a public official with misconduct in office	(law) a document that states some contractual relationship or grants some right