refrigeration vs cooling

refrigeration and cooling both are nouns.

Word	Noun	Adjective	Verb	Adverb
refrigeration	Yes	No	No	No
cooling	Yes	No	No	No

As nouns, cooling is a hypernym of refrigeration; that is, cooling is a word with a broader meaning than refrigeration:

refrigeration: the process of cooling or freezing (e.g., food) for preservative purposes
cooling: the process of becoming cooler; a falling temperature

Other hypernyms of refrigeration include chilling, temperature reduction, preservation.

refrigeration (noun)	cooling (noun)
deliberately lowering the body's temperature for therapeutic purposes	a mechanism for keeping something cool
the process of cooling or freezing (e.g., food) for preservative purposes	the process of becoming cooler; a falling temperature