filiform vs filamentous

filiform and filamentous both are adjectives.

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

As adjectives, filiform and filamentous are synonyms defined as:

Other synonyms of filiform include filamentlike, threadlike, thready.

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