euphonious vs idiom

euphonious is not a noun while idiom is a noun.

Word	Noun	Adjective	Verb	Adverb
euphonious	No	Yes	No	No
idiom	Yes	No	No	No

euphonious (noun)	idiom (noun)
	the style of a particular artist or school or movement
	the usage or vocabulary that is characteristic of a specific group of people
	an expression whose meanings cannot be inferred from the meanings of the words that make it up
	a manner of speaking that is natural to native speakers of a language

euphonious (adjective)	idiom (adjective)
having a pleasant sound
(of speech or dialect) pleasing in sound; not harsh or strident