stew vs cook

stew and cook both are nouns.

Word	Noun	Adjective	Verb	Adverb
stew	Yes	No	Yes	No
cook	Yes	No	Yes	No

As verbs, cook is a hypernym of stew; that is, cook is a word with a broader meaning than stew:

stew (noun)	cook (noun)
food prepared by stewing especially meat or fish with vegetables	someone who cooks food
agitation resulting from active worry

stew (verb)	cook (verb)
cook slowly and for a long time in liquid	transform and make suitable for consumption by heating
bear a grudge; harbor ill feelings	transform by heating
be in a huff; be silent or sullen	prepare for eating by applying heat
	prepare a hot meal
	tamper, with the purpose of deception