valvotomy vs surgical incision

valvotomy and surgical incision both are nouns.

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

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

valvotomy: incision into a stenosed cardiac valve to relieve the obstruction
surgical incision: the cutting of or into body tissues or organs (especially by a surgeon as part of an operation)

Other hypernyms of valvotomy include incision, section.

valvotomy (noun)	surgical incision (noun)
incision into a stenosed cardiac valve to relieve the obstruction	the cutting of or into body tissues or organs (especially by a surgeon as part of an operation)