surgical operation vs surgical procedure

surgical operation and surgical procedure both are nouns.

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

As nouns, surgical operation and surgical procedure are synonyms defined as:

surgical operation and surgical procedure: a medical procedure involving an incision with instruments; performed to repair damage or arrest disease in a living body

Other synonyms of surgical operation include operation, surgery, surgical process.

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