pit-run gravel vs bank gravel

pit-run gravel and bank gravel both are nouns.

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

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

Other synonyms of pit-run gravel include pit run.

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