NOR - Used to introduce a further negative statement.
ONE - A numerical value equal to 1; the first number in the set of natural numbers (especially in number theory); the cardinality of the smallest nonempty set. Ordinal: first.
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.
PEN - An enclosed area used to contain domesticated animals, especially sheep or cattle.
PER - For each.
PRO - An advantage of something, especially when contrasted with its disadvantages (cons).
REP - Short form of reputation.
NOPE - To hit someone on the head.
OPEN - Which is not closed; accessible; unimpeded; as, an open gate.
OVEN - A chamber used for baking or heating.
OVER - In radio communications: end of sentence, ready to receive reply.
ROPE - Thick strings, yarn, monofilaments, metal wires, or strands of other cordage that are twisted together to form a stronger line.
PEON - A lowly person, a peasant or serf, a labourer who is obliged to do menial work.
ROVE - To shoot with arrows (at).
PORE - A tiny opening in the skin.
REPO - Repossession.
PRONE - Lying face downward; prostrate.
PROVE - To demonstrate that something is true or viable; to give proof for.
PROVEN - Having been proved; having proved its value or truth.