gravel vs shingle

gravel and shingle both are nouns.

Word	Noun	Adjective	Verb	Adverb
gravel	Yes	No	Yes	No
shingle	Yes	No	Yes	No

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

gravel: 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 gravel include ballast, bank gravel, pit-run gravel, pit run.

gravel (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)

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