apron vs apron string

apron and apron string both are nouns.

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

apron (noun)	apron string (noun)
a garment of cloth or leather or plastic that is tied about the waist and worn to protect your clothing	(usually used in the plural) a cord used to tie an apron at the waist
a paved surface where aircraft stand while not being used
the part of a modern theater stage between the curtain and the orchestra (i.e., in front of the curtain)
(golf) the part of the fairway leading onto the green