shoe string vs lacing

shoe string and lacing both are nouns.

Word	Noun	Adjective	Verb	Adverb
shoe string	Yes	No	No	No
lacing	Yes	No	No	No

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

shoe string: a lace used for fastening shoes
lacing: a cord that is drawn through eyelets or around hooks in order to draw together two edges (as of a shoe or garment)

Other hypernyms of shoe string include lace.

shoe string (noun)	lacing (noun)
a lace used for fastening shoes	the act of inflicting corporal punishment with repeated blows
a small amount of money	a cord that is drawn through eyelets or around hooks in order to draw together two edges (as of a shoe or garment)
	a small amount of liquor added to a food or beverage