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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,