polyphonic vs polyphonous

polyphonic and polyphonous both are adjectives.

Word	Noun	Adjective	Verb	Adverb
polyphonic	No	Yes	No	No
polyphonous	No	Yes	No	No

As adjectives, polyphonic and polyphonous are synonyms defined as:

polyphonic and polyphonous: of or relating to or characterized by polyphony

polyphonic (adjective)	polyphonous (adjective)
having two or more independent but harmonically related melodic parts sounding together	of or relating to or characterized by polyphony
of or relating to or characterized by polyphony
having two or more phonetic values