The term 'not common' can be described by a variety of words, such as ROYAL, PATRICIAN, ODD, RARE, REGAL, EMINENT, UNCANNY, and FABULOUS. ROYAL is a five-letter word meaning belonging to or befitting a monarch, while PATRICIAN is a nine-letter word meaning belonging to a ruling class. ODD is a three-letter word meaning not usual or not expected, and RARE is a four-letter word meaning not often occurring or found. REGAL is a five-letter word meaning having the stately dignity or grandeur of a monarch, and EMINENT is a seven-letter word meaning standing out above others. UNCANNY is a seven-letter word meaning strange or mysterious, and FABULOUS is an eight-letter word meaning extraordinary or incredible. Finally, OCCASIONAL is a ten-letter word meaning happening from time to time. All of these words describe something that is not common.