bring down vs air

bring down is not a noun while air is a noun.

Word	Noun	Adjective	Verb	Adverb
bring down	No	No	Yes	No
air	Yes	No	Yes	No

bring down (noun)	air (noun)
	travel via aircraft
	a distinctive but intangible quality surrounding a person or thing
	a succession of notes forming a distinctive sequence
	medium for radio and television broadcasting
	the region above the ground
	the mass of air surrounding the Earth
	a slight wind (usually refreshing)
	a mixture of gases (especially oxygen) required for breathing; the stuff that the wind consists of
	once thought to be one of four elements composing the universe (Empedocles), associated with the humour blood

bring down (verb)	air (verb)
cut down on; make a reduction in	expose to cool or cold air so as to cool or freshen
impose something unpleasant	expose to warm or heated air, so as to dry
cause to be enthusiastic	make public
cause to come to the ground	broadcast over the airwaves, as in radio or television
move something or somebody to a lower position	be broadcast
cause the downfall of; of rulers	expose to fresh air