surgical operation vs decorticate

surgical operation is a noun but decorticate is not a noun.

Word	Noun	Adjective	Verb	Adverb
surgical operation	Yes	No	No	No
decorticate	No	No	Yes	No

surgical operation (noun)	decorticate (noun)
a medical procedure involving an incision with instruments; performed to repair damage or arrest disease in a living body

surgical operation (verb)	decorticate (verb)
	remove the cortex of (an organ)
	remove the outer layer of