cooling system vs cooling

cooling system and cooling both are nouns.

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

As nouns, cooling system and cooling are synonyms defined as:

cooling system (noun)	cooling (noun)
a mechanism for keeping something cool	a mechanism for keeping something cool
equipment in a motor vehicle that cools the engine	the process of becoming cooler; a falling temperature