ADD - To join or unite, as one thing to another, or as several particulars, so as to increase the number, augment the quantity, or enlarge the magnitude, or so as to form into one aggregate. Hence: To sum up; to put together mentally.
CAP - A close-fitting head covering either without a brim or with a peak.
COD - A bag.
COP - To (be forced to) take; to receive; to shoulder; to bear, especially blame or punishment for a particular instance of wrongdoing.
DAD - A father, a male parent.
DOC - A doctor.
OAK - A tree of the genus Quercus.
ODD - Single; sole; singular; not having a mate.
PAD - A flattened mass of anything soft, to sit or lie on.
POD - A seed case for legumes (e.g. peas, beans, peppers).
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.
ADO - To do; in doing; as, there is nothing ado.
DOCK - Any of the genus Rumex of coarse weedy plants with small green flowers related to buckwheat, especially the common dock, and used as potherbs and in folk medicine, especially in curing nettle rash.
PACK - A bundle made up and prepared to be carried; especially, a bundle to be carried on the back; a load for an animal; a bale, as of goods.
CODA - A passage which brings a movement or piece to a conclusion through prolongation.
PADDOCK - A frog or toad.