smoke alarm vs alarm

smoke alarm and alarm both are nouns.

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

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

Other hypernyms of smoke alarm include alarm system, warning device.

smoke alarm (noun)	alarm (noun)
an alarm that is tripped off by fire or smoke	a device that signals the occurrence of some undesirable event
	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

smoke alarm (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