CB is an acronym for CITIZENS Band, a type of RADIO communication. The term can be broken down into five different crossword solutions: RADIO (5 letters), OVER (4 letters), Radioed (7 letters), HAM (3 letters), and NINE (4 letters). RADIO refers to the type of communication used, OVER is a term used to indicate the end of a transmission, Radioed is the past tense of the verb 'to RADIO', HAM is a slang term for an amateur RADIO operator, and NINE is the number of channels available for use in CB RADIO.