apron string vs cord

apron string and cord both are nouns.

Word	Noun	Adjective	Verb	Adverb
apron string	Yes	No	No	No
cord	Yes	No	Yes	No

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

apron string: (usually used in the plural) a cord used to tie an apron at the waist
cord: a line made of twisted fibers or threads

apron string (noun)	cord (noun)
(usually used in the plural) a cord used to tie an apron at the waist	a line made of twisted fibers or threads
	a cut pile fabric with vertical ribs; usually made of cotton
	a light insulated conductor for household use
	a unit of amount of wood cut for burning; 128 cubic feet

apron string (verb)	cord (verb)
	stack in cords
	bind or tie with a cord