The term 'not just big' can be described by four words: HUGE, GIANT, OBESE, and EPIC. The word 'HUGE' is a four letter word that means very large in size or amount. The word 'GIANT' is a five letter word that means something that is much larger than normal. The word 'OBESE' is also a five letter word that means having an excessive amount of body fat. Lastly, the word 'EPIC' is a four letter word that means something that is grand or impressive in scale or character. All of these words describe something that is not just big, but much larger than normal.