vocal cord vs plica

vocal cord and plica both are nouns.

Word	Noun	Adjective	Verb	Adverb
vocal cord	Yes	No	No	No
plica	Yes	No	No	No

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

vocal cord: either of two pairs of folds of mucous membrane projecting into the larynx
plica: a folded part (as in skin or muscle)

Other hypernyms of vocal cord include fold.

vocal cord (noun)	plica (noun)
either of two pairs of folds of mucous membrane projecting into the larynx	a folded part (as in skin or muscle)