Dielectric and Glass wool

Dielectric noun - A material such as glass or porcelain with negligible electrical or thermal conductivity.

Glass wool and dielectric are semantically related. In some cases you can replace phrase "Glass wool" with "Dielectric", this terms are similar.

Glass wool noun - Glass fibers spun and massed into bundles resembling wool.

Dielectric and glass wool are semantically related. You can use "Dielectric" instead a noun phrase "Glass wool".