Arguing over petty things is a common occurrence in many relationships. QUIBBLE, which has seven letters, is defined as to argue or complain about trivial matters. Pettifog, which has eight letters, is defined as to argue or QUIBBLE over trivial matters. SPAT, which has four letters, is defined as a brief argument or disagreement. Lastly, NIT, which has three letters, is defined as a minor criticism or objection. All of these terms can be used to describe the act of arguing over petty things.