sneak away vs slip away

sneak away and slip away both are verbs.

Word	Noun	Adjective	Verb	Adverb
sneak away	No	No	Yes	No
slip away	No	No	Yes	No

As verbs, sneak away and slip away are synonyms defined as:

Other synonyms of sneak away include slip out, sneak off, sneak out, steal away.

sneak away (verb)	slip away (verb)
leave furtively and stealthily	for time to move forward
	leave furtively and stealthily