iridotomy vs eye surgery

iridotomy and eye surgery both are nouns.

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

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

iridotomy: a surgical procedure that makes an incision in the iris of the eye in order to enlarge the pupil or to treat closed-angle glaucoma
eye surgery: any surgical procedure involving the eyes

Other hypernyms of iridotomy include eye operation.

iridotomy (noun)	eye surgery (noun)
a surgical procedure that makes an incision in the iris of the eye in order to enlarge the pupil or to treat closed-angle glaucoma	any surgical procedure involving the eyes