go away vs leave

go away is not a noun while leave is a noun.

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

As verbs, go away and leave are synonyms defined as:

Other synonyms of go away include go forth.

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

Other hypernyms of go away include exit, get out, go out.

go away (noun)	leave (noun)
	the act of departing politely
	permission to do something
	the period of time during which you are absent from work or duty

go away (verb)	leave (verb)
get lost, as without warning or explanation	leave unchanged or undisturbed or refrain from taking
go away from a place	be survived by after one's death
move away from a place into another direction	leave behind unintentionally
become invisible or unnoticeable	go and leave behind, either intentionally or by neglect or forgetfulness
	move out of or depart from
	go away from a place
	leave or give by will after one's death
	transmit (knowledge or skills)
	put into the care or protection of someone
	remove oneself from an association with or participation in
	produce as a result or residue
	make a possibility or provide opportunity for; permit to be attainable or cause to remain
	act or be so as to become in a specified state
	have left or have as a remainder