filament vs hypha

filament and hypha both are nouns.

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

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

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

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