ARK - A large box with a flat lid.
ART - Human effort to imitate, supplement, alter, or counteract the work of nature.
ATE - Simple past of eat.
EAT - To consume (something solid or semi-solid, usually food) by putting it into the mouth and swallowing it.
RAT - A medium-sized rodent belonging to the genus Rattus.
TAR - A black, oily, sticky, viscous substance, consisting mainly of hydrocarbons derived from organic materials such as wood, peat, or coal.
TEA - The dried leaves or buds of the tea plant, Camellia sinensis.
EEK - Representing a scream or shriek (especially in comic strips).
EKE - To increase; to add to, augment, lengthen.
RATE - A wage calculated in relation to a unit of time.
TAKE - To grasp with the hands.
TEAR - To rend (a solid material) by holding or restraining in two places and pulling apart, whether intentionally or not; to destroy or separate.
TREE - A large plant, not exactly defined, but typically over four meters in height, a single trunk which grows in girth with age and branches (which also grow in circumference with age).
TREK - A slow or difficult journey.
REEK - A strong unpleasant smell.
RAKE - A garden tool with a row of pointed teeth fixed to a long handle, used for collecting grass or debris, or for loosening soil.
TEAK - An extremely durable timber highly valued for shipbuilding and other purposes, yielded by Tectona grandis (and Tectona spp.).
EATER - Agent noun of eat; one who eats.
TAKER - One who takes something.
RETAKE - To take something again.