walk away vs go away

walk away and go away both are verbs.

Word	Noun	Adjective	Verb	Adverb
walk away	No	No	Yes	No
go away	No	No	Yes	No

As verbs, go away is a hypernym of walk away; that is, go away is a word with a broader meaning than walk away:

Other hypernyms of walk away include go forth, leave.

walk away (verb)	go away (verb)
go away from	get lost, as without warning or explanation
	go away from a place
	move away from a place into another direction
	become invisible or unnoticeable