slip away vs go forth

slip away and go forth both are verbs.

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

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

Other hypernyms of slip away include go away, leave.

slip away (verb)	go forth (verb)
for time to move forward	come out of
leave furtively and stealthily	go away from a place