incision vs valvulotomy

incision and valvulotomy both are nouns.

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

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

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

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