incision vs perineotomy

incision and perineotomy both are nouns.

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

As nouns, perineotomy is a hyponym of incision; that is, perineotomy 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)
perineotomy: surgical incision into the perineum

incision (noun)	perineotomy (noun)
the cutting of or into body tissues or organs (especially by a surgeon as part of an operation)	surgical incision into the perineum
a depression scratched or carved into a surface