doorbell vs buzzer

doorbell and buzzer both are nouns.

Word	Noun	Adjective	Verb	Adverb
doorbell	Yes	No	No	No
buzzer	Yes	No	No	No

As nouns, doorbell and buzzer are synonyms defined as:

doorbell and buzzer: a push button at an outer door that gives a ringing or buzzing signal when pushed

Other synonyms of doorbell include bell.

doorbell (noun)	buzzer (noun)
a push button at an outer door that gives a ringing or buzzing signal when pushed	a push button at an outer door that gives a ringing or buzzing signal when pushed
	a signaling device that makes a buzzing sound