LASEK vs eye operation

LASEK and eye operation both are nouns.

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

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

LASEK: a refractive surgery procedure that reshapes the cornea, creating a hinged flap in the epithelial layer of the eye
eye operation: any surgical procedure involving the eyes

Other hypernyms of LASEK include eye surgery.

LASEK (noun)	eye operation (noun)
a refractive surgery procedure that reshapes the cornea, creating a hinged flap in the epithelial layer of the eye	any surgical procedure involving the eyes