legal instrument vs legal document

legal instrument and legal document both are nouns.

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

As nouns, legal instrument and legal document are synonyms defined as:

legal instrument and legal document: (law) a document that states some contractual relationship or grants some right

Other synonyms of legal instrument include instrument, official document.

legal instrument (noun)	legal document (noun)
(law) a document that states some contractual relationship or grants some right	(law) a document that states some contractual relationship or grants some right