bring down vs aviation

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

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

bring down (noun)	aviation (noun)
	travel via aircraft
	the art of operating aircraft
	the aggregation of a country's military aircraft
	the operation of aircraft to provide transportation

bring down (verb)	aviation (verb)
cut down on; make a reduction in
impose something unpleasant
cause to be enthusiastic
cause to come to the ground
move something or somebody to a lower position
cause the downfall of; of rulers