The term 'on fire' can be described in many ways, including 'ALIGHT' (6 letters), 'FIERY' (5 letters), 'HOT' (3 letters), 'LIT' (3 letters), 'ABLAZE' (6 letters), 'AFLAME' (6 letters), 'FLAMING' (7 letters), 'inazone' (7 letters), 'inablaze' (8 letters), and 'emblazing' (9 letters). All of these words refer to something that is burning or has been set on fire, and is usually used to describe a situation that is intense or exciting.