pile
A single 'piece' of sand is called a 'grain'.
Pile cap formwork is the formwork built to mold the concrete that binding together the pile or group of piles and the structure supported by the piles such as structure's foundation or column.
pile on
They would be called a team. Or a squad
A collection of paper is commonly referred to as a stack or a pile.
A group of books is typically called a library or a collection of books.
a 100 pile of lakes.
a big pile of stones scratch that... a broadside i think....
The origin of the word dog pile is thought to be from the term used for a pile of sleeping dogs. A dog pile is usually formed when a group of people usually piles on top of a single person.
A group of leaves is called a pile. A pile of leaves is collected together during the autumn season when they fall from the trees.
packagebunch, group, collection, mass, pile, stack, heap, batch