nephrotomy vs surgical incision

nephrotomy and surgical incision both are nouns.

Word	Noun	Adjective	Verb	Adverb
nephrotomy	Yes	No	No	No
surgical incision	Yes	No	No	No

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

nephrotomy: incision into a kidney (usually to remove a kidney stone)
surgical incision: the cutting of or into body tissues or organs (especially by a surgeon as part of an operation)

Other hypernyms of nephrotomy include incision, section.

nephrotomy (noun)	surgical incision (noun)
incision into a kidney (usually to remove a kidney stone)	the cutting of or into body tissues or organs (especially by a surgeon as part of an operation)