Jam n. : A kind of frock for children.

Jam n. : See Jamb.

Jam v. t. : To press into a close or tight position; to crowd; to squeeze; to wedge in.

Jam v. t. : To crush or bruise; as, to jam a finger in the crack of a door.

Jam v. t. : To bring (a vessel) so close to the wind that half her upper sails are laid aback.

Jam n. : A mass of people or objects crowded together; also, the pressure from a crowd; a crush; as, a jam in a street; a jam of logs in a river.

Jam n. : An injury caused by jamming.

Jam n. : A preserve of fruit boiled with sugar and water; as, raspberry jam; currant jam; grape jam.

Example:
Can preserves be used instead of Jam for Jam thumbprint cookies?

Taxonomy
fruit, jelly, fruit preserves, sugar, jams, marmalade, pectin, vegetables, conserves, Apple, fruit juice, Confit, the jam, Fruit butter, citrus fruits, fruits and vegetables, cook, 09-20.

Defination from the web:
jams, called freezer jam, because they are stored frozen, are popular in parts of North America for their very fresh taste. ... Making Jams and Jellies. Making Jams, Marmalades, Preserves, and Conserves. Varies Jam Recipes (Black ...