incision vs surgical operation

incision and surgical operation both are nouns.

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

incision (noun)	surgical operation (noun)
the cutting of or into body tissues or organs (especially by a surgeon as part of an operation)	a medical procedure involving an incision with instruments; performed to repair damage or arrest disease in a living body
a depression scratched or carved into a surface