pleasure trip vs airing

pleasure trip and airing both are nouns.

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

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

Other hyponyms of pleasure trip include field trip.

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