orchotomy vs incision

orchotomy and incision both are nouns.

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

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

orchotomy: surgical incision into the testis to obtain material for analysis (as in cases of abnormally low sperm count)
incision: the cutting of or into body tissues or organs (especially by a surgeon as part of an operation)

Other hypernyms of orchotomy include section, surgical incision.

orchotomy (noun)	incision (noun)
surgical incision into the testis to obtain material for analysis (as in cases of abnormally low sperm count)	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