frontbencher vs legislator

frontbencher and legislator both are nouns.

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

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

frontbencher: a member of the House of Commons who is a minister in the government or who holds an official position in an opposition party
legislator: someone who makes or enacts laws

frontbencher (noun)	legislator (noun)
a member of the House of Commons who is a minister in the government or who holds an official position in an opposition party	someone who makes or enacts laws