transmission vs airing

transmission and airing both are nouns.

Word	Noun	Adjective	Verb	Adverb
transmission	Yes	No	No	No
airing	Yes	No	No	No

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

transmission (noun)	airing (noun)
the act of sending a message; causing a message to be transmitted	the act of supplying fresh air and getting rid of foul air
the gears that transmit power from an automobile engine via the driveshaft to the live axle	a short excursion (a walk or ride) in the open air
communication by means of transmitted signals	the opening of a subject to widespread discussion and debate
an incident in which an infectious disease is transmitted
the fraction of radiant energy that passes through a substance