The term 'not square' can be described by a variety of words, including 'HIP' (3 letters), 'OBLONG' (6 letters), 'HIE' (3 letters), 'ROUND' (5 letters), and 'BIASED' (6 letters). HIP means stylish or fashionable, OBLONG is an elongated shape, HIE means to move quickly, ROUND is circular, and BIASED implies prejudice or favoritism. Together, these words describe something that is not square, which is typically a four-sided shape with equal sides and angles.