airing vs excursion

airing and excursion both are nouns.

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

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

Other hypernyms of airing include expedition, jaunt, junket, outing, pleasure trip, sashay.

airing (noun)	excursion (noun)
the act of supplying fresh air and getting rid of foul air	a journey taken for pleasure
a short excursion (a walk or ride) in the open air	wandering from the main path of a journey
the opening of a subject to widespread discussion and debate