phlebotomy vs incision

phlebotomy and incision both are nouns.

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

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

phlebotomy: surgical incision into a vein; used to treat hemochromatosis
incision: the cutting of or into body tissues or organs (especially by a surgeon as part of an operation)

Other hypernyms of phlebotomy include section, surgical incision, bloodletting.

phlebotomy (noun)	incision (noun)
surgical incision into a vein; used to treat hemochromatosis	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