eye surgery vs surgery

eye surgery and surgery both are nouns.

Word	Noun	Adjective	Verb	Adverb
eye surgery	Yes	No	No	No
surgery	Yes	No	No	No

As nouns, surgery is a hypernym of eye surgery; that is, surgery is a word with a broader meaning than eye surgery:

eye surgery: any surgical procedure involving the eyes
surgery: a medical procedure involving an incision with instruments; performed to repair damage or arrest disease in a living body

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

eye surgery (noun)	surgery (noun)
any surgical procedure involving the eyes	a medical procedure involving an incision with instruments; performed to repair damage or arrest disease in a living body
	a room in a hospital equipped for the performance of surgical operations
	a room where a doctor or dentist can be consulted
	the branch of medical science that treats disease or injury by operative procedures