dead air vs interruption

dead air and interruption both are nouns.

Word	Noun	Adjective	Verb	Adverb
dead air	Yes	No	No	No
interruption	Yes	No	No	No

As nouns, interruption is a hypernym of dead air; that is, interruption is a word with a broader meaning than dead air:

dead air: an inadvertent interruption in a broadcast during which there is no sound
interruption: a time interval during which there is a temporary cessation of something

Other hypernyms of dead air include break, intermission, pause, suspension.

dead air (noun)	interruption (noun)
an inadvertent interruption in a broadcast during which there is no sound	an act of delaying or interrupting the continuity
	some abrupt occurrence that interrupts an ongoing activity
	a time interval during which there is a temporary cessation of something