filter vs glass wool

filter and glass wool both are nouns.

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

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

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

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