airing vs pleasure trip

airing and pleasure trip both are nouns.

Word	Noun	Adjective	Verb	Adverb
airing	Yes	No	No	No
pleasure trip	Yes	No	No	No

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

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

airing (noun)	pleasure trip (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
the opening of a subject to widespread discussion and debate