filch vs sneak

filch is not a noun while sneak is a noun.

Word	Noun	Adjective	Verb	Adverb
filch	No	No	Yes	No
sneak	Yes	Yes	Yes	No

As verbs, filch and sneak are synonyms defined as:

Other synonyms of filch include abstract, cabbage, hook, lift, nobble, pilfer, pinch, purloin, snarf, swipe.

filch (noun)	sneak (noun)
	someone acting as an informer or decoy for the police
	someone who prowls or sneaks about; usually with unlawful intentions
	a person who is regarded as underhanded and furtive and contemptible

filch (adjective)	sneak (adjective)
	marked by quiet and caution and secrecy; taking pains to avoid being observed

filch (verb)	sneak (verb)
make off with belongings of others	to go stealthily or furtively
	make off with belongings of others
	pass on stealthily
	put, bring, or take in a secretive or furtive manner