fade out vs fade away

fade out and fade away both are verbs.

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

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

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

Other synonyms of fade out include dissolve.

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