representative vs legislator

representative and legislator both are nouns.

Word	Noun	Adjective	Verb	Adverb
representative	Yes	Yes	No	No
legislator	Yes	No	No	No

As nouns, legislator is a hypernym of representative; that is, legislator is a word with a broader meaning than representative:

representative (noun)	legislator (noun)
an item of information that is typical of a class or group	someone who makes or enacts laws
a person who represents others
a member of the United States House of Representatives
an advocate who represents someone else's policy or purpose

representative (adjective)	legislator (adjective)
standing for something else
being or characteristic of government by representation in which citizens exercise power through elected officers and representatives
serving to represent or typify