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Insulator (noun)
A substance that does not transmit heat (thermal insulator), sound (acoustic insulator) or electricity (electrical insulator).
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Insulator (noun)
100px|right|insulator A non-conductive structure, coating or device that does not transmit sound, heat or electricity (see image)
“To isolate electrical wires from the pylons supporting them, one often uses glass insulators.”
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Insulator (noun)
A person who installs insulation.
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Isolator (noun)
An electrical device that detects short circuits and isolates them.
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Isolator (noun)
A device that isolates something from the surrounding environment to keep it sterile.
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Isolator (noun)
A transparent box for holding small live animals.
Wiktionary