laparotomy vs incision

laparotomy and incision both are nouns.

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

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

laparotomy: surgical incision into the abdominal wall; often done to examine abdominal organs
incision: the cutting of or into body tissues or organs (especially by a surgeon as part of an operation)

Other hypernyms of laparotomy include section, surgical incision.

laparotomy (noun)	incision (noun)
surgical incision into the abdominal wall; often done to examine abdominal organs	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