mandate vs legal instrument

mandate and legal instrument both are nouns.

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

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

mandate: a document giving an official instruction or command
legal instrument: (law) a document that states some contractual relationship or grants some right

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

mandate (noun)	legal instrument (noun)
the commission that is given to a government and its policies through an electoral victory	(law) a document that states some contractual relationship or grants some right
a document giving an official instruction or command
a territory surrendered by Turkey or Germany after World War I and put under the tutelage of some other European power until they are able to stand by themselves