filum vs filament

filum and filament both are nouns.

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

As nouns, filum and filament are synonyms defined as:

filum and filament: a threadlike structure (as a chainlike series of cells)

filum (noun)	filament (noun)
a threadlike structure (as a chainlike series of cells)	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