preserver vs cook

preserver and cook both are nouns.

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

As nouns, cook is a hypernym of preserver; that is, cook is a word with a broader meaning than preserver:

preserver (noun)	cook (noun)
rescue equipment consisting of a buoyant belt or jacket to keep a person from drowning	someone who cooks food
a skilled worker who is employed to restore or refinish buildings or antique furniture
someone who keeps safe from harm or danger
a cook who preserves fruits or meat

preserver (verb)	cook (verb)
	transform and make suitable for consumption by heating
	transform by heating
	prepare for eating by applying heat
	prepare a hot meal
	tamper, with the purpose of deception