ART - Human effort to imitate, supplement, alter, or counteract the work of nature.
HAT - A covering for the head, often in the approximate form of a cone or a cylinder closed at its top end, and sometimes having a brim and other decoration.
HOT - Of an object, having a high temperature.
OAR - An implement used to propel a boat or a ship in the water, having a flat blade at one end, being rowed from the other end and being normally fastened to the vessel.
OUR - Belonging to us.
OUT - Away from home or one's usual place, or not indoors.
RAT - A medium-sized rodent belonging to the genus Rattus.
ROT - To suffer decomposition due to biological action, especially by fungi or bacteria.
RUT - Sexual desire or oestrus of cattle, and various other mammals.
TAR - A black, oily, sticky, viscous substance, consisting mainly of hydrocarbons derived from organic materials such as wood, peat, or coal.
AUTO - An automobile.
HOUR - A time period of sixty minutes; one twenty-fourth of a day.
HURT - To be painful.
OATH - A solemn pledge or promise to a god, king, or another person, to attest to the truth of a statement or contract.
TOUR - A journey through a particular building, estate, country, etc.
ROUT - To make a noise; roar; bellow; snort.
THRU - Alternative spelling of through.
HART - A male deer, especially the male of the red deer after its fifth year.
THOU - You singular informal, nominative case.
AUTHOR - The originator or creator of a work, especially of a literary composition.