gastromy vs incision

gastromy and incision both are nouns.

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

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

gastromy: surgical incision into the stomach
incision: the cutting of or into body tissues or organs (especially by a surgeon as part of an operation)

Other hypernyms of gastromy include section, surgical incision.

gastromy (noun)	incision (noun)
surgical incision into the stomach	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