Groups of things in English
Stack (, ): a stack of chairs, a stack of books, a stack of work, a stack of plates
Set (): a set of tools, a set of underwear, a set of compasses, a set of cutlery
Pile / Heap (): a pile of clothes, a heap of bodies.
Bunch (, ): a bunch of flowers, a bunch of grapes, a bunch of bananas.
Bundle (, , ): a bundle of newspapers, a bundle of sticks, a bundle of nothing.
Batch (, , ): a batch of homebrew, a batch of letters, a batch of recruits.
Stash (): a stash of cash, a stash of beer, a stash of weapons. (usually the things are hidden)
Fleet (): a fleet of ships