harmonious vs harmonic

harmonious is not a noun while harmonic is a noun.

Word	Noun	Adjective	Verb	Adverb
harmonious	No	Yes	No	No
harmonic	Yes	Yes	No	No

harmonious (noun)	harmonic (noun)
	any of a series of musical tones whose frequencies are integral multiples of the frequency of a fundamental
	a tone that is a component of a complex sound

harmonious (adjective)	harmonic (adjective)
musically pleasing	of or relating to harmony as distinct from melody and rhythm
exhibiting equivalence or correspondence among constituents of an entity or between different entities	of or relating to the branch of acoustics that studies the composition of musical sounds
existing together in harmony	of or relating to harmonics
suitable and fitting	involving or characterized by harmony
	relating to vibrations that occur as a result of vibrations in a nearby body