sneak away vs slip out

sneak away and slip out both are verbs.

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

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

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

sneak away (verb)	slip out (verb)
leave furtively and stealthily	leave furtively and stealthily