sneak off vs slip away

sneak off and slip away both are verbs.

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

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

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

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