pit run vs bank gravel

pit run and bank gravel both are nouns.

Word	Noun	Adjective	Verb	Adverb
pit run	Yes	No	No	No
bank gravel	Yes	No	No	No

As nouns, pit run and bank gravel are synonyms defined as:

Other synonyms of pit run include pit-run gravel.

pit run (noun)	bank gravel (noun)
gravel as found in natural deposits	gravel as found in natural deposits