surgical knife vs knife

surgical knife and knife both are nouns.

Word	Noun	Adjective	Verb	Adverb
surgical knife	Yes	No	No	No
knife	Yes	No	Yes	No

As nouns, knife is a hypernym of surgical knife; that is, knife is a word with a broader meaning than surgical knife:

surgical knife: a very sharp knife used in surgery
knife: edge tool used as a cutting instrument; has a pointed blade with a sharp edge and a handle

Other hypernyms of surgical knife include surgical instrument.

surgical knife (noun)	knife (noun)
a very sharp knife used in surgery	edge tool used as a cutting instrument; has a pointed blade with a sharp edge and a handle
	a weapon with a handle and blade with a sharp point
	any long thin projection that is transient

surgical knife (verb)	knife (verb)
	use a knife on