Just as sophiecentaur said a resistor is any wire under normal conditions , copper, aluminum , iron etc all that changes from one to another is the resistance , some have lower some higher some very high.
What we normally refer to as a resistor in printed circuit boards or any other electronics , radio or otherwise stuff is a resistor which is a special kind of little device with two legs and a special coating on it usually , depending on the resistance needed they can be just a wire wound around a little tube (wire wound resistors) they are made for higher power ratings or they can be some metal oxide layer which has a poor conduction so turns out to be a good resistor.