a device for lifting heavy objects
jack
it is a frame or shelf, usually with bars or hooks, that is used for holding things or for hanging things on
rack
a large bag made of strong cloth, paper, or plastic, used to store large amounts of something
sack
a small, sharp broad-headed nail
tack
the name of a boy who fell down in a song of Jack and Jill
Jack
the rear surface of the human body from the shoulders to the hips.
back
a small cardboard or paper container and the items contained within it.
pack