air filter vs air cleaner

air filter and air cleaner both are nouns.

Word	Noun	Adjective	Verb	Adverb
air filter	Yes	No	No	No
air cleaner	Yes	No	No	No

As nouns, air filter and air cleaner are synonyms defined as:

air filter and air cleaner: a filter that removes dust from the air that passes through it

air filter (noun)	air cleaner (noun)
a filter that removes dust from the air that passes through it	a filter that removes dust from the air that passes through it