air conditioning vs air conditioner

air conditioning and air conditioner both are nouns.

Word	Noun	Adjective	Verb	Adverb
air conditioning	Yes	No	No	No
air conditioner	Yes	No	No	No

As nouns, air conditioning and air conditioner are synonyms defined as:

air conditioning and air conditioner: a system that keeps air cool and dry

air conditioning (noun)	air conditioner (noun)
a system that keeps air cool and dry	a system that keeps air cool and dry
	an appliance designed to extract humidity from the air and thereby cool it