filamentous vs filament

filamentous is not a noun while filament is a noun.

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

filamentous (noun)	filament (noun)
	a thin wire (usually tungsten) that is heated white hot by the passage of an electric current
	a threadlike structure (as a chainlike series of cells)
	the stalk of a stamen
	a very slender natural or synthetic fiber

filamentous (adjective)	filament (adjective)
thin in diameter; resembling a thread