sandpile vs sandbox

sandpile and sandbox both are nouns.

Word	Noun	Adjective	Verb	Adverb
sandpile	Yes	No	No	No
sandbox	Yes	No	No	No

As nouns, sandpile and sandbox are synonyms defined as:

sandpile and sandbox: a plaything consisting of a pile of sand or a box filled with sand for children to play in

Other synonyms of sandpile include sandpit.

sandpile (noun)	sandbox (noun)
a plaything consisting of a pile of sand or a box filled with sand for children to play in	a plaything consisting of a pile of sand or a box filled with sand for children to play in
	mold consisting of a box with sand shaped to mold metal