crushed rock vs shingle

crushed rock and shingle both are nouns.

Word	Noun	Adjective	Verb	Adverb
crushed rock	Yes	No	No	No
shingle	Yes	No	Yes	No

As nouns, shingle is a hyponym of crushed rock; that is, shingle is a word with a more specific, narrower meaning than crushed rock:

crushed rock: rock fragments and pebbles
shingle: coarse beach gravel of small waterworn stones and pebbles (or a stretch of shore covered with such gravel)

Other hyponyms of crushed rock include ballast, bank gravel, pit-run gravel, pit run.

crushed rock (noun)	shingle (noun)
rock fragments and pebbles	a small signboard outside the office of a lawyer or doctor, e.g.
	building material used as siding or roofing
	coarse beach gravel of small waterworn stones and pebbles (or a stretch of shore covered with such gravel)

crushed rock (verb)	shingle (verb)
	cover with shingles