international nautical mile vs air mile

international nautical mile and air mile both are nouns.

Word	Noun	Adjective	Verb	Adverb
international nautical mile	Yes	No	No	No
air mile	Yes	No	No	No

As nouns, international nautical mile and air mile are synonyms defined as:

international nautical mile and air mile: a unit of length used in navigation; exactly 1,852 meters; historically based on the distance spanned by one minute of arc in latitude

Other synonyms of international nautical mile include mi, mile, naut mi, nautical mile.

international nautical mile (noun)	air mile (noun)
a unit of length used in navigation; exactly 1,852 meters; historically based on the distance spanned by one minute of arc in latitude	a unit of length used in navigation; exactly 1,852 meters; historically based on the distance spanned by one minute of arc in latitude