filament vs chromatid

filament and chromatid both are nouns.

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

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

filament: a very slender natural or synthetic fiber
chromatid: one of two identical strands into which a chromosome splits during mitosis

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

filament (noun)	chromatid (noun)
a thin wire (usually tungsten) that is heated white hot by the passage of an electric current	one of two identical strands into which a chromosome splits during mitosis
a threadlike structure (as a chainlike series of cells)
the stalk of a stamen
a very slender natural or synthetic fiber