ARE - Second-person singular simple present tense of be.
ARK - A large box with a flat lid.
EAR - The organ of hearing, consisting of the pinna, auditory canal, eardrum, malleus, incus, stapes and cochlea.
ERA - A time period of indeterminate length, generally more than one year.
ERR - To make a mistake.
CARE - Grief, sorrow.
RACE - A contest between people, animals, vehicles, etc. where the goal is to be the first to reach some objective. Several horses run in a horse race, and the first one to reach the finishing post wins.
RACK - A series of one or more shelves, stacked one above the other.
RARE - Cooked very lightly, so the meat is still red (in the case of steak or beef in the general sense).
REAR - To raise physically; to lift up; to cause to rise, to elevate.
ACRE - A field.
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.
CARER - Someone who looks after another, either as a job or often through family responsibilities.
RACER - Someone who takes part in a race.
CREAK - The sound produced by anything that creaks; a creaking.
RERACK - An instance of reracking the balls to restart a frame.