airing vs transmission

airing and transmission both are nouns.

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

As nouns, transmission is a hypernym of airing; that is, transmission is a word with a broader meaning than airing:

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