ORE - Rock that contains utilitarian materials; primarily a rock containing metals or gems which (at the time of the rock's evaluation and proposal for extraction) are able to be separated from its neighboring minerals and processed at a cost that does not exceed those materials' present-day economic values.
ROT - To suffer decomposition due to biological action, especially by fungi or bacteria.
TOE - Each of the five digits on the end of the foot.
VET - A veterinarian or veterinary surgeon.
COT - A symbol of the trigonometric function cotangent.
CORE - The central part of fruit, containing the kernels or seeds.
COVE - A fellow; a man.
OVER - In radio communications: end of sentence, ready to receive reply.
TORE - Hard, difficult; wearisome, tedious.
VETO - A political right to disapprove of (and thereby stop) the process of a decision, a law etc.
VOTE - A formalized choice on matters of administration or other democratic activities.
ROVE - To shoot with arrows (at).
ROTE - The process of learning or committing something to memory through mechanical repetition, usually by hearing and repeating aloud, often without full attention to comprehension or thought for the meaning.
COVER - A lid.
VOTER - Someone who votes.
COVET - To wish for with eagerness; to desire possession of, often enviously.
OVERT - Open and not secret nor concealed.
TROVE - A treasure trove; a collection of treasure.
COVERT - Hidden, covered over; overgrown, sheltered.
VECTOR - A directed quantity, one with both magnitude and direction; the signed difference between two points.