fire alarm vs smoke alarm

fire alarm and smoke alarm both are nouns.

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

As nouns, fire alarm and smoke alarm are synonyms defined as:

fire alarm and smoke alarm: an alarm that is tripped off by fire or smoke

fire alarm (noun)	smoke alarm (noun)
an alarm that is tripped off by fire or smoke	an alarm that is tripped off by fire or smoke
a shout or bell to warn that fire has broken out