The term 'SPRING MO' is composed of four crossword solutions: APRIL (5 letters), MAR (3 letters), ROE (3 letters), and Apr (3 letters). APRIL is the fourth month of the year in the Gregorian calendar, and is associated with the beginning of spring. MAR is an abbreviation for March, the third month of the year. ROE is a type of fish eggs, which are often found in abundance during the spring months. Finally, Apr is an abbreviation for APRIL, the fourth month of the year. Together, these four solutions form the term 'SPRING MO, ' which is a reference to the season of spring.