cook vs preserver

cook and preserver both are nouns.

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

As nouns, preserver is a hyponym of cook; that is, preserver is a word with a more specific, narrower meaning than cook:

Other hyponyms of cook include chef, cookie, cooky, fry cook, roaster, seasoner.

cook (noun)	preserver (noun)
someone who cooks food	rescue equipment consisting of a buoyant belt or jacket to keep a person from drowning
	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

cook (verb)	preserver (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