refrigerator vs cooler

refrigerator and cooler both are nouns.

Word	Noun	Adjective	Verb	Adverb
refrigerator	Yes	No	No	No
cooler	Yes	No	No	No

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

Other hyponyms of refrigerator include ice chest, electric refrigerator, fridge.

refrigerator (noun)	cooler (noun)
white goods in which food can be stored at low temperatures	a refrigerator for cooling liquids
	a cell for violent prisoners
	an iced drink especially white wine and fruit juice