resection vs surgical operation

resection and surgical operation both are nouns.

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

As nouns, surgical operation is a hypernym of resection; that is, surgical operation is a word with a broader meaning than resection:

resection: surgical removal of part of a structure or organ
surgical operation: a medical procedure involving an incision with instruments; performed to repair damage or arrest disease in a living body

Other hypernyms of resection include operation, surgery, surgical procedure, surgical process.

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