filament vs cobweb

filament and cobweb both are nouns.

Word	Noun	Adjective	Verb	Adverb
filament	Yes	No	No	No
cobweb	Yes	No	No	No

As nouns, cobweb is a hyponym of filament; that is, cobweb is a word with a more specific, narrower meaning than filament:

Other hyponyms of filament include barb, gossamer, chromatid, myofibril, myofibrilla, sarcostyle, rhizoid, hypha, paraphysis.

filament (noun)	cobweb (noun)
a thin wire (usually tungsten) that is heated white hot by the passage of an electric current	a dense elaborate spider web that is more efficient than the orb web
a threadlike structure (as a chainlike series of cells)	filaments from a web that was spun by a spider
the stalk of a stamen	a fabric so delicate and transparent as to resemble a web of a spider
a very slender natural or synthetic fiber