air terminal vs airport terminal

air terminal and airport terminal both are nouns.

Word	Noun	Adjective	Verb	Adverb
air terminal	Yes	No	No	No
airport terminal	Yes	No	No	No

As nouns, air terminal and airport terminal are synonyms defined as:

air terminal and airport terminal: a terminal that serves air travelers or air freight

air terminal (noun)	airport terminal (noun)
a terminal that serves air travelers or air freight	a terminal that serves air travelers or air freight