Answer: wordofmouth

AnswerCrossword Clue
WORDOFMOUTHOrthodontist's diagnosis?
WORDOFMOUTHBuzz medium
WORDOFMOUTHThe grapevine
WORDOFMOUTHInformal oral communication
WORDOFMOUTHHow rumors spread
WORDOFMOUTHHearsay