valvulotomy vs incision

valvulotomy and incision both are nouns.

Word	Noun	Adjective	Verb	Adverb
valvulotomy	Yes	No	No	No
incision	Yes	No	No	No

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

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

Other hypernyms of valvulotomy include section, surgical incision.

valvulotomy (noun)	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)
	a depression scratched or carved into a surface