airline vs airline business

airline and airline business both are nouns.

Word	Noun	Adjective	Verb	Adverb
airline	Yes	No	No	No
airline business	Yes	No	No	No

As nouns, airline and airline business are synonyms defined as:

airline and airline business: a commercial enterprise that provides scheduled flights for passengers

Other synonyms of airline include airway.

airline (noun)	airline business (noun)
a commercial enterprise that provides scheduled flights for passengers	a commercial enterprise that provides scheduled flights for passengers
a hose that carries air under pressure