air hole

English Thesaurus

1. a hole that allows the passage of air (noun.artifact)

hypernym	:	hole,
definition	:	an opening deliberately made in or through something (noun.artifact)

2. a local region of low pressure or descending air that causes a plane to lose height suddenly (noun.phenomenon)

hypernym	:	atmospheric phenomenon,
definition	:	a physical phenomenon associated with the atmosphere (noun.phenomenon)