The crossword solution for the term COPPER, NOTABLY is CONDUCTOR. Copper is a metal that is highly conductive, meaning it is able to transfer electricity and heat efficiently. This makes copper an ideal material for electrical wiring and other applications where conductivity is important. Copper is also used in many other industries, such as plumbing, jewelry making, and even art. Copper's ability to conduct electricity and heat makes it a notable material in many different fields.