incision vs orchotomy

incision and orchotomy both are nouns.

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

As nouns, orchotomy is a hyponym of incision; that is, orchotomy 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)
orchotomy: surgical incision into the testis to obtain material for analysis (as in cases of abnormally low sperm count)

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