The term 'PREFIX WITH GRAM OR METER' can be solved by four different prefixes: SONO (4 letters), CENTI (5 letters), DIA (3 letters), and MILLI (5 letters). SONO is a prefix meaning sound or noise, CENTI is a prefix meaning one-hundredth, DIA is a prefix meaning across or through, and MILLI is a prefix meaning one-thousandth. These prefixes are often used in combination with the words gram or meter to indicate a unit of measurement.