pit run vs gravel

pit run and gravel both are nouns.

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

As nouns, gravel is a hypernym of pit run; that is, gravel is a word with a broader meaning than pit run:

Other hypernyms of pit run include crushed rock.

pit run (noun)	gravel (noun)
gravel as found in natural deposits	rock fragments and pebbles

pit run (verb)	gravel (verb)
	be a mystery or bewildering to
	cover with gravel
	cause annoyance in; disturb, especially by minor irritations