Calycle and Eyecup

Calycle noun - A small cup-shaped structure (as a taste bud or optic cup or cavity of a coral containing a polyp).

Eyecup and calycle are semantically related. In some cases you can replace term "Eyecup" with "Calycle", this nouns are similar.

Eyecup noun - (embryology) a two-walled cuplike depression that develops into the pigmented and sensory layers of the retina.

Calycle and eyecup are semantically related. You can use "Calycle" instead a noun "Eyecup".