bank gravel vs pit-run gravel

bank gravel and pit-run gravel both are nouns.

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

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

Other synonyms of bank gravel include pit run.

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