pit run vs pit-run gravel

pit run and pit-run gravel both are nouns.

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

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

Other synonyms of pit run include bank gravel.

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