OAR - An implement used to propel a boat or a ship in the water, having a flat blade at one end, being rowed from the other end and being normally fastened to the vessel.
PAD - A flattened mass of anything soft, to sit or lie on.
PAR - By; with.
POD - A seed case for legumes (e.g. peas, beans, peppers).
PRO - An advantage of something, especially when contrasted with its disadvantages (cons).
RAP - A sharp blow with something hard.
ROD - A straight, round stick, shaft, bar, cane, or staff.
RAD - Excellent, short for radical.
ADO - To do; in doing; as, there is nothing ado.
POX - A disease characterized by purulent skin eruptions that may leave pockmarks.
DROP - A small mass of liquid just large enough to hold its own weight via surface tension, usually one that falls from a source of liquid.
ROAD - At the venue of the opposing team or competitor.
PROD - To poke, to push, to touch.
PARA - Formerly, a subunit of currency in several countries in the Ottoman/Turkish and Yugoslav regions.
PARADOX - A self-contradictory statement, which can only be true if it is false, and vice versa.