door bell phone vs door phone

door bell phone and door phone both are nouns.

Word	Noun	Adjective	Verb	Adverb
door bell phone	Yes	No	No	No
door phone	Yes	No	No	No

As nouns, door bell phone and door phone are synonyms defined as:

door bell phone and door phone: a set of electrical and electronic elements used to handle two-way communication (street to home) in houses, apartments or villas.

door bell phone (noun)	door phone (noun)
a set of electrical and electronic elements used to handle two-way communication (street to home) in houses, apartments or villas.	a set of electrical and electronic elements used to handle two-way communication (street to home) in houses, apartments or villas.