The term 'start up again' can be expressed in a variety of ways. The five crossword solutions for this term are RENEW (5 letters), REOPEN (6 letters), REIGNITE (8 letters), RESUME (6 letters), and REACTIVATE (10 letters). RENEW implies the process of making something new or fresh again, while REOPEN suggests the act of reopening something that has been closed. REIGNITE implies the process of reigniting something that has been extinguished, while RESUME implies the process of resuming something that has been stopped. Finally, REACTIVATE implies the process of reactivating something that has been deactivated.