The term 'make certain' can be expressed in a variety of ways, each with its own number of letters. The crossword solutions for this term include 'CONFIRM' (7 letters), 'ENSURE' (6 letters), 'INSURE' (6 letters), 'ASSURE' (6 letters), 'GUARANTEE' (9 letters), 'ASCERTAIN' (9 letters), 'seetoit' (7 letters), and 'takenochances' (13 letters). All of these words mean to make sure something is true or will happen, but they vary in terms of the degree of certainty they imply. For example, 'CONFIRM' implies that something is already known to be true, while 'GUARANTEE' implies a promise that something will happen. 'Seetoit' and 'takenochances' are more colloquial expressions that mean to make sure something happens without taking any risks.