ACT - Something done, a deed.
CAP - A close-fitting head covering either without a brim or with a peak.
CAT - Any similar animal of the family Felidae, which includes lions, tigers, bobcats, etc.
CUT - Having been cut.
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.
HUT - A small wooden shed.
PAT - The sound of a light slap or tap with a soft flat object, especially of a footstep.
PUT - To place something somewhere.
TAP - A tapering cylindrical pin or peg used to stop the vent in a cask; a spigot.
APT - Suitable; appropriate; fit or fitted; suited.
TAU - The name of the letter T/τ in the Greek, Hebrew and ancient Semitic alphabets, being the nineteenth letter of the Classical and Modern Greek, the twentieth letter of Old and Ancient Greek.
CHAT - To be engaged in informal conversation.
PACT - An agreement; a compact; a covenant.
PATH - A trail for the use of, or worn by, pedestrians.
CHAP - A man, a fellow.
CATCH - The act of seizing or capturing.
PATCH - A piece of cloth, or other suitable material, sewed or otherwise fixed upon a garment to repair or strengthen it, especially upon an old garment to cover a hole.
CATCHUP - A variant of catsup or ketchup.