A start up is the process of beginning a business or other venture. The crossword solutions for the term START UP include INITIATE (8 letters), BOOT (4 letters), BEGIN (5 letters), KINDLE (6 letters), STIRUP (6 letters), WHIPUP (6 letters), COMMENCE (8 letters), and RESURRECT (9 letters). These words all describe the process of starting something new, from initiating the idea to booting up the computer to kindling the flame of a new venture. Stirring up enthusiasm, whipping up excitement, commencing the journey, and resurrecting an old idea are all part of the start up process.