filament vs barb

filament and barb both are nouns.

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

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

filament: a very slender natural or synthetic fiber
barb: one of the parallel filaments projecting from the main shaft of a feather

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

filament (noun)	barb (noun)
a thin wire (usually tungsten) that is heated white hot by the passage of an electric current	one of the parallel filaments projecting from the main shaft of a feather
a threadlike structure (as a chainlike series of cells)	a subsidiary point facing opposite from the main point that makes an arrowhead or spear hard to remove
the stalk of a stamen	the pointed part of barbed wire
a very slender natural or synthetic fiber	an aggressive remark directed at a person like a missile and intended to have a telling effect

filament (verb)	barb (verb)
	provide with barbs