alarum

As nouns the difference between alarum and klaxon

is that alarum is a danger signal or warning while klaxon is a loud electric horn or alarm.

As verbs the difference between alarum and klaxon

is that alarum is (archaic) to sound alarums, to sound an alarm while klaxon is to produce a loud, siren-like wail.

As nouns the difference between alarum and larum

is that alarum is a danger signal or warning while larum is .

As a verb alarum

is (archaic) to sound alarums, to sound an alarm.