fade away vs fade out

fade away and fade out both are verbs.

Word	Noun	Adjective	Verb	Adverb
fade away	No	No	Yes	No
fade out	No	No	Yes	No

As verbs, fade away and fade out are synonyms defined as:

fade away and fade out: grow less and less substantial until it disappears

Other synonyms of fade away include dissolve.

fade away (verb)	fade out (verb)
grow less and less substantial until it disappears	grow less and less substantial until it disappears