ACT - Something done, a deed.
ANT - Any of various insects in the family Formicidae in the order Hymenoptera, typically living in large colonies composed almost entirely of flightless females.
ARC - A directed edge.
ART - Human effort to imitate, supplement, alter, or counteract the work of nature.
CAN - To know how to; to be able to.
CAR - A wheeled vehicle, drawn by a horse or other animal.
CAT - Any similar animal of the family Felidae, which includes lions, tigers, bobcats, etc.
CUT - Having been cut.
RAT - A medium-sized rodent belonging to the genus Rattus.
RUT - Sexual desire or oestrus of cattle, and various other mammals.
TAN - A symbol of the trigonometric function tangent.
TAR - A black, oily, sticky, viscous substance, consisting mainly of hydrocarbons derived from organic materials such as wood, peat, or coal.
AUNT - A sister or sister-in-law of someone's parent.
CART - A small, open, wheeled vehicle, drawn or pushed by a person or animal, more often used for transporting goods than passengers.
TUNA - Any of several species of fish, of the genus Thunnus, in the family Scombridae.
TURN - Of a body, person, etc, to move around an axis through itself.
CURT - Brief or terse, especially to the point of being rude.
RUNT - The smallest animal of a litter.
RANT - A criticism done by ranting.
CURRANT - A small dried grape, usually the Black Corinth grape, rarely more than 4mm diameter when dried.