ACT - Something done, a deed.
AID - Help; assistance; succor, relief.
CAT - Any similar animal of the family Felidae, which includes lions, tigers, bobcats, etc.
DAY - Any period of 24 hours.
ICY - Pertaining to, resembling, or abounding in ice; cold; frosty.
TAD - A small amount; a little bit.
CAD - A person who stands at the door of an omnibus to open and shut it, and to receive fares; an idle hanger-on about innyards.
TIC - A local and habitual convulsive motion of certain muscles.
CAY - A small, low island largely made of sand or coral.
ACID - Sour, sharp, or biting to the taste; tart; having the taste of vinegar.
CITY - A large settlement, bigger than a town.
TIDY - Arranged neatly and in order.
ACIDITY - The quality or state of being acid.