MAMA' (4 letters) 'BABY' (3 letters) The term 'BIGGEST OF THE THREE BEARS' refers to the three characters from the classic fairy tale, 'Goldilocks and the Three Bears'. PAPA Bear is the biggest of the three bears, MAMA Bear is the middle-sized bear, and BABY Bear is the smallest. PAPA Bear is represented by the four-letter word 'PAPA', MAMA Bear is represented by the four-letter word 'MAMA', and BABY Bear is represented by the three-letter word 'BABY'.