tocsin vs alarm

tocsin and alarm both are nouns.

Word	Noun	Adjective	Verb	Adverb
tocsin	Yes	No	No	No
alarm	Yes	No	Yes	No

As nouns, alarm is a hypernym of tocsin; that is, alarm is a word with a broader meaning than tocsin:

Other hypernyms of tocsin include alarum, alert, warning signal.

tocsin (noun)	alarm (noun)
a bell used to sound an alarm	a device that signals the occurrence of some undesirable event
the sound of an alarm (usually a bell)	a clock that wakes a sleeper at some preset time
	an automatic signal (usually a sound) warning of danger
	fear resulting from the awareness of danger

tocsin (verb)	alarm (verb)
	warn or arouse to a sense of danger or call to a state of preparedness
	fill with apprehension or alarm; cause to be unpleasantly surprised