The term 'put on cloud nine' is an idiom that means to be extremely happy or elated. The crossword solutions for this term are SENT (4 letters), SEND (4 letters), and ELATE (5 letters). SENT and SEND are both verbs that mean to cause something to go from one place to another, usually by post or electronically. ELATE is an adjective that means to be in a state of great joy or happiness. Together, these words can be used to describe the feeling of being put on cloud nine.