go away vs go forth

go away and go forth both are verbs.

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

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

Other synonyms of go away include leave.

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