Ram: to force or push something into a tight space,
Cram: to push or force something into a small space,
Stuff: to fill a space with something, often in a loose or disorderly manner.
Pack: to fill a space with something, often in a tight or compact manner.
Jam: to force or push something into a tight space, often with a sense of difficulty or effort.
Wedge: to force or push something into a tight space,