Both groups will be required per row, first to take a card with me, then you've got to whisper words that tell a friend so on until everyone has been last man out for students to write words that are heard on the Board.
Both groups need each other to make the first line cards coming out with me. Then you put the words to tell friends to go on until everyone. Finally, the students write out the words on the board to hear them properly.
Both groups will have to stand in line to get by the first word card to me. Then you take vocabulary to whisper to continue until all. And the last student out write vocabulary heard on the board.