The term 'absolutely certain' can be expressed in a variety of ways. The crossword solutions for this term are 'SURE' (4 letters), 'POSITIVE' (8 letters), and 'suresure' (8 letters). 'SURE' is an informal way of expressing certainty, while 'POSITIVE' implies a more confident attitude. 'Suresure' is an emphatic way of expressing absolute certainty. All three words convey the same meaning, but with different levels of emphasis.