air conditioner vs appliance

air conditioner and appliance both are nouns.

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

As nouns, appliance is a hypernym of air conditioner; that is, appliance is a word with a broader meaning than air conditioner:

air conditioner: an appliance designed to extract humidity from the air and thereby cool it
appliance: durable goods for home or office use

air conditioner (noun)	appliance (noun)
a system that keeps air cool and dry	durable goods for home or office use
an appliance designed to extract humidity from the air and thereby cool it	a device or control that is very useful for a particular job