iridectomy vs eye operation

iridectomy and eye operation both are nouns.

Word	Noun	Adjective	Verb	Adverb
iridectomy	Yes	No	No	No
eye operation	Yes	No	No	No

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

iridectomy: an eye operation that treats closed-angle glaucoma by surgical removal of part of the iris of the eye
eye operation: any surgical procedure involving the eyes

Other hypernyms of iridectomy include eye surgery.

iridectomy (noun)	eye operation (noun)
an eye operation that treats closed-angle glaucoma by surgical removal of part of the iris of the eye	any surgical procedure involving the eyes