aviation vs flying

aviation and flying both are nouns.

Word	Noun	Adjective	Verb	Adverb
aviation	Yes	No	No	No
flying	Yes	Yes	No	No

As nouns, flying is a hyponym of aviation; that is, flying is a word with a more specific, narrower meaning than aviation:

Other hyponyms of aviation include flight.

aviation (noun)	flying (noun)
travel via aircraft	an instance of traveling by air
the art of operating aircraft
the aggregation of a country's military aircraft
the operation of aircraft to provide transportation

aviation (adjective)	flying (adjective)
	hurried and brief
	moving swiftly