door phone vs door bell phone

door phone and door bell phone both are nouns.

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

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

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

door phone (noun)	door bell 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.