klaxon

As a noun klaxon

is a loud electric horn or alarm.

As a verb klaxon

is to produce a loud, siren-like wail.

As an adjective false is

(label) one of two states of a boolean variable; logic.

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 siren and klaxon

is that siren is (original sense) One of a group of nymphs who lured mariners to their death on the rocks while klaxon is a loud electric horn or alarm.

As verbs the difference between siren and klaxon

is that siren is to make a noise with, or as if with, a siren while klaxon is {{cx|intransitive|lang=en}} To produce a loud, siren-like wail.

As an adjective siren

is relating to or like a siren.

As nouns the difference between claxon and klaxon

is that claxon is an alternative spelling of lang=en while klaxon is a loud electric horn or alarm.

As a verb klaxon is

{{cx|intransitive|lang=en}} To produce a loud, siren-like wail.

Securityalarm is likely misspelled.

Securityalarm has no English definition.

As a noun klaxon

is a loud electric horn or alarm.

As a verb klaxon

is {{cx|intransitive|lang=en}} To produce a loud, siren-like wail.

As nouns the difference between tocsin and klaxon

is that tocsin is an alarm or other signal sounded by a bell or bells, especially with reference to france while klaxon is a loud electric horn or alarm.

As a verb klaxon is

to produce a loud, siren-like wail.