epicanthus vs plica

epicanthus and plica both are nouns.

Word	Noun	Adjective	Verb	Adverb
epicanthus	Yes	No	No	No
plica	Yes	No	No	No

As nouns, plica is a hypernym of epicanthus; that is, plica is a word with a broader meaning than epicanthus:

epicanthus: a vertical fold of skin over the nasal canthus; typical for many east Asian peoples; sometimes occurs in Down's syndrome
plica: a folded part (as in skin or muscle)

Other hypernyms of epicanthus include fold.

epicanthus (noun)	plica (noun)
a vertical fold of skin over the nasal canthus; typical for many east Asian peoples; sometimes occurs in Down's syndrome	a folded part (as in skin or muscle)