Answer: knocker

AnswerCrossword Clue
KNOCKERDoor appurtenance.
KNOCKERFront door part.
KNOCKERLow-tech alternative to a buzzer
KNOCKERAlternative to a buzzer
knockerone that knocks (to strike sharply)
knockerA person who continually finds fault
knockervulgar. A woman's breasts