air-conditioner vs A/C

air-conditioner and A/C both are nouns.

Word	Noun	Adjective	Verb	Adverb
air-conditioner	Yes	No	No	No
A/C	Yes	No	No	No

As nouns, air-conditioner and A/C are synonyms defined as:

air-conditioner and A/C: an appliance designed to extract humidity from the air and thereby cool it

Other synonyms of air-conditioner include air conditioner.

air-conditioner (noun)	A/C (noun)
an appliance designed to extract humidity from the air and thereby cool it	an appliance designed to extract humidity from the air and thereby cool it