AHA - An exclamation of understanding, realization, invention, or recognition.
BAT - Any of the small, nocturnal, flying mammals of the order Chiroptera, which navigate by means of echolocation. They look like a mouse with membranous wings extending from the forelimbs to the hind limbs or tail. Altogether, there are about 1,000 bat species in the world.
BIT - A piece of metal placed in a horse's mouth and connected to reins to direct the animal.
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.
HIT - To administer a blow to.
TAB - A small flap or strip of material attached to something, for holding, manipulation, identification, etc.
BAH - Expressing contempt, disgust, or bad temper.
AAH - Indication of amazement or surprise or enthusiasm.
BAIT - Any substance, especially food, used in catching fish, or other animals, by alluring them to a hook, snare, trap, or net.
BATH - A tub or pool which is used for bathing: bathtub.
THAT - The (thing) being indicated (at a distance from the speaker, or previously mentioned, or at another time).
HABIT - An action done on a regular basis.
HABITAT - A specific place or natural conditions in which a plant or animal lives.