optic vs stemma

optic and stemma both are nouns.

Word	Noun	Adjective	Verb	Adverb
optic	Yes	Yes	No	No
stemma	Yes	No	No	No

As nouns, stemma is a hyponym of optic; that is, stemma is a word with a more specific, narrower meaning than optic:

Other hyponyms of optic include naked eye, peeper, oculus dexter, OD, oculus sinister, OS, ocellus, simple eye, compound eye.

optic (noun)	stemma (noun)
the organ of sight	an eye having a single lens
	the hereditary derivation of an individual
	a tree diagram showing a reconstruction of the transmission of manuscripts of a literary work

optic (adjective)	stemma (adjective)
of or relating to or resembling the eye
relating to or using sight