air hole vs air pocket

air hole and air pocket both are nouns.

Word	Noun	Adjective	Verb	Adverb
air hole	Yes	No	No	No
air pocket	Yes	No	No	No

As nouns, air hole and air pocket are synonyms defined as:

air hole and air pocket: a local region of low pressure or descending air that causes a plane to lose height suddenly

Other synonyms of air hole include pocket.

air hole (noun)	air pocket (noun)
a hole that allows the passage of air	a local region of low pressure or descending air that causes a plane to lose height suddenly
a local region of low pressure or descending air that causes a plane to lose height suddenly