glass wool vs filter

glass wool and filter both are nouns.

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

As nouns, filter is a hypernym of glass wool; that is, filter is a word with a broader meaning than glass wool:

Other hypernyms of glass wool include dielectric, insulator, nonconductor.

glass wool (noun)	filter (noun)
glass fibers spun and massed into bundles resembling wool	device that removes something from whatever passes through it
	an electrical device that alters the frequency spectrum of signals passing through it

glass wool (verb)	filter (verb)
	remove by passing through a filter
	pass through
	run or flow slowly, as in drops or in an unsteady stream