Carat, Caret, Carrot, Karat

Carat – a measure of weight used mainly for gemstones, equal to 200 mg.

Caret – a typographic mark shaped like an inverted V.

Carrot – a plant of the parsley family, or its edible root.

Karat – a measure of the percentage of gold in an alloy, equal to 4.1667%. (Though it is worth noting that outside the US, this spelling is not used. Instead, this AND the gemstone usage are both spelled "carat.")