official document vs legal document

official document and legal document both are nouns.

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

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

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

Other synonyms of official document include instrument, legal instrument.

official document (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