sawbones vs amputator

sawbones and amputator both are nouns.

Word	Noun	Adjective	Verb	Adverb
sawbones	Yes	No	No	No
amputator	Yes	No	No	No

As nouns, amputator is a hyponym of sawbones; that is, amputator is a word with a more specific, narrower meaning than sawbones:

Other hyponyms of sawbones include cosmetic surgeon, plastic surgeon, brain surgeon, neurosurgeon.

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