insulator vs glass wool

insulator and glass wool both are nouns.

Word	Noun	Adjective	Verb	Adverb
insulator	Yes	No	No	No
glass wool	Yes	No	No	No

As nouns, glass wool is a hyponym of insulator; that is, glass wool is a word with a more specific, narrower meaning than insulator:

insulator: a material such as glass or porcelain with negligible electrical or thermal conductivity
glass wool: glass fibers spun and massed into bundles resembling wool

Other hyponyms of insulator include bushing, mineral wool, rock wool, ferroelectric material.

insulator (noun)	glass wool (noun)
a material such as glass or porcelain with negligible electrical or thermal conductivity	glass fibers spun and massed into bundles resembling wool