air-to-surface missile vs air-to-ground missile

air-to-surface missile and air-to-ground missile both are nouns.

Word	Noun	Adjective	Verb	Adverb
air-to-surface missile	Yes	No	No	No
air-to-ground missile	Yes	No	No	No

As nouns, air-to-surface missile and air-to-ground missile are synonyms defined as:

air-to-surface missile and air-to-ground missile: a missile designed to be launched from an airplane at a target on the ground

air-to-surface missile (noun)	air-to-ground missile (noun)
a missile designed to be launched from an airplane at a target on the ground	a missile designed to be launched from an airplane at a target on the ground