amputator vs operating surgeon

amputator and operating surgeon both are nouns.

Word	Noun	Adjective	Verb	Adverb
amputator	Yes	No	No	No
operating surgeon	Yes	No	No	No

As nouns, operating surgeon is a hypernym of amputator; that is, operating surgeon is a word with a broader meaning than amputator:

Other hypernyms of amputator include sawbones, surgeon.

amputator (noun)	operating surgeon (noun)
a surgeon who removes part or all of a limb	a physician who specializes in surgery