valvulotomy vs valvotomy

valvulotomy and valvotomy both are nouns.

Word	Noun	Adjective	Verb	Adverb
valvulotomy	Yes	No	No	No
valvotomy	Yes	No	No	No

As nouns, valvulotomy and valvotomy are synonyms defined as:

valvulotomy and valvotomy: incision into a stenosed cardiac valve to relieve the obstruction

valvulotomy (noun)	valvotomy (noun)
incision into a stenosed cardiac valve to relieve the obstruction	incision into a stenosed cardiac valve to relieve the obstruction