sandbox vs sandpile

sandbox and sandpile both are nouns.

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

As nouns, sandbox and sandpile are synonyms defined as:

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

Other synonyms of sandbox include sandpit.

sandbox (noun)	sandpile (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