The term FIRST, SECOND OR THIRD can be broken down into three crossword solutions: ORDINAL (7 letters), BASE (4 letters), and SACK (4 letters). ORDINAL is an adjective that describes a number in a series, such as first, second, or third. BASE is a noun that refers to the starting point of a system or process. Finally, SACK is a verb meaning to dismiss someone from a job or position. Together, these three words describe the concept of being the first, second, or third in a series, with the implication that someone may be dismissed if they are not in the top three.