true vocal cord vs vocal cord

true vocal cord and vocal cord both are nouns.

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

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

true vocal cord: either of the two lower vocal folds that come together to form the glottis; produce a vocal tone when they are approximated and air from the lungs passes between them
vocal cord: either of two pairs of folds of mucous membrane projecting into the larynx

Other hypernyms of true vocal cord include plica vocalis, vocal band, vocal fold.

true vocal cord (noun)	vocal cord (noun)
either of the two lower vocal folds that come together to form the glottis; produce a vocal tone when they are approximated and air from the lungs passes between them	either of two pairs of folds of mucous membrane projecting into the larynx