caliculus vs optic cup

caliculus and optic cup both are nouns.

Word	Noun	Adjective	Verb	Adverb
caliculus	Yes	No	No	No
optic cup	Yes	No	No	No

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

caliculus: a small cup-shaped structure (as a taste bud or optic cup or cavity of a coral containing a polyp)
optic cup: (embryology) a two-walled cuplike depression that develops into the pigmented and sensory layers of the retina

Other hyponyms of caliculus include eyecup.

caliculus (noun)	optic cup (noun)
a small cup-shaped structure (as a taste bud or optic cup or cavity of a coral containing a polyp)	(embryology) a two-walled cuplike depression that develops into the pigmented and sensory layers of the retina