alarm vs scare

alarm and scare both are nouns.

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

As verbs, scare is a hypernym of alarm; that is, scare is a word with a broader meaning than alarm:

Other hypernyms of alarm include affright, fright, frighten.

alarm (noun)	scare (noun)
a device that signals the occurrence of some undesirable event	a sudden attack of fear
a clock that wakes a sleeper at some preset time	sudden mass fear and anxiety over anticipated events
an automatic signal (usually a sound) warning of danger
fear resulting from the awareness of danger

alarm (verb)	scare (verb)
warn or arouse to a sense of danger or call to a state of preparedness	cause fear in
fill with apprehension or alarm; cause to be unpleasantly surprised	cause to lose courage; to be daunted; to be scared away