The difference between Biscuit and Cracker

Biscuit as a noun (chiefly, UK, Australia, Ireland, NZ, rare in the US):

A small, flat, baked good which is either hard and crisp or else soft but firm: a cookie.

Biscuit as a noun (chiefly, North America):

A small, usually soft and flaky bread, generally made with baking soda, which is similar in texture to a scone but which is usually not sweet.

Biscuit as a noun (UK):

A cracker.

Biscuit as a noun (nautical):

The "bread" formerly supplied to naval ships, which was made with very little water, kneaded into flat cakes and slowly baked, and which often became infested with weevils.

Biscuit as a noun:

A form of unglazed earthenware.

Biscuit as a noun:

A light brown colour.

Biscuit as a noun (woodworking):

A thin oval wafer of wood or other material inserted into mating slots on pieces of material to be joined to provide gluing surface and strength in shear.

Biscuit as a noun (US, slang):

A plastic card bearing the codes for authorizing a nuclear attack.

Biscuit as a noun (US, slang, hiphop):

A handgun, especially a revolver.

Biscuit as a noun (ice hockey):

A hockey puck.

Cracker as a noun:

A dry, thin, crispy baked bread (usually salty or savoury, but sometimes sweet, as in the case of graham crackers and animal crackers).

Cracker as a noun:

A short piece of twisted string tied to the end of a whip that creates the distinctive sound when the whip is thrown or cracked.

Cracker as a noun:

A firecracker.

Cracker as a noun:

A person or thing that cracks, or that cracks a thing (e.g. whip cracker; nutcracker). The final section of certain whips, which is made of a short, thin piece of unravelled rope and produces a cracking sound.

Cracker as a noun:

A Christmas cracker.

Cracker as a noun:

Refinery equipment used to pyrolyse organic feedstocks. If catalyst is used to aid pyrolysis it is informally called a cat-cracker

Cracker as a noun (slang, chiefly, British):

A fine thing or person (crackerjack).

Cracker as a noun:

An ambitious or hard-working person (i.e. someone who arises at the 'crack' of dawn).

Cracker as a noun (computing):

One who cracks (i.e. overcomes) computer software or security restrictions.

Cracker as a noun (obsolete):

A noisy boaster; a swaggering fellow.

Cracker as a noun (US, derogatory, racial slur):

An impoverished white person from the southeastern United States, originally associated with Georgia and parts of Florida; any white person.

Cracker as a noun (US, Florida, slang, derogatory):

A police officer.

Cracker as a noun:

A northern pintail, species of dabbling duck.

Cracker as a noun (obsolete):

A pair of fluted rolls for grinding caoutchouc.