stack
a pile of things, one on top of another.
split
to tear or crack, perhaps by mistake
spill
to let something drop or overflow from a container.
sort
to arrange things into different types or groups.
slither
to slide along.
slide
to move smoothly over a surface.
shuffle
to mix things up to change their order.
shrink
to become smaller.
separate
to set apart from each other.