The term 'ought' is a verb that expresses an obligation or DUTY. The crossword solutions for this term are 'HAVE', 'NOTHING', 'DUTY', 'ZERO', 'SHOULD', and 'MUST'. 'HAVE' implies possession, while 'NOTHING' implies the lack of something. 'DUTY' and 'SHOULD' both refer to an obligation or responsibility, while 'ZERO' and 'MUST' both indicate a requirement. Together, these words suggest that one ought to HAVE something, fulfill their DUTY, and SHOULD or MUST do something with no exceptions.