osteotomy vs surgical operation

osteotomy and surgical operation both are nouns.

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

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

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

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

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