The difference between Corn-cracker and Cracker

Corn-cracker as a noun (US, archaic, mildly, _, derogatory):

A lower-class white person in the southern US.

Corn-cracker as a noun (US, archaic):

An agricultural machine for removing the shells from corn.

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.