monofocal lens implant vs IOL

monofocal lens implant and IOL both are nouns.

Word	Noun	Adjective	Verb	Adverb
monofocal lens implant	Yes	No	No	No
IOL	Yes	No	No	No

As nouns, IOL is a hypernym of monofocal lens implant; that is, IOL is a word with a broader meaning than monofocal lens implant:

monofocal lens implant: a lens with a single focus that is used after cataract surgery to provide clear distance vision
IOL: a clear plastic lens that is implanted in the eye; usually done when the natural lens has been removed in a cataract operation

Other hypernyms of monofocal lens implant include interocular lens implant, lens implant.

monofocal lens implant (noun)	IOL (noun)
a lens with a single focus that is used after cataract surgery to provide clear distance vision	a clear plastic lens that is implanted in the eye; usually done when the natural lens has been removed in a cataract operation