airing vs spreading

airing and spreading both are nouns.

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

As nouns, airing and spreading are synonyms defined as:

airing and spreading: the opening of a subject to widespread discussion and debate

Other synonyms of airing include dissemination, public exposure.

airing (noun)	spreading (noun)
the act of supplying fresh air and getting rid of foul air	act of extending over a wider scope or expanse of space or time
a short excursion (a walk or ride) in the open air	the opening of a subject to widespread discussion and debate
the opening of a subject to widespread discussion and debate	process or result of distributing or extending over a wide expanse of space