shoelace vs shoestring

shoelace and shoestring both are nouns.

Word	Noun	Adjective	Verb	Adverb
shoelace	Yes	No	No	No
shoestring	Yes	No	No	No

As nouns, shoelace and shoestring are synonyms defined as:

Other synonyms of shoelace include shoe lace, shoe string.

shoelace (noun)	shoestring (noun)
a lace used for fastening shoes	a lace used for fastening shoes
	a small amount of money