The term 'change completely' can be represented by three different crossword solutions: REDO (4 letters), REVAMP (6 letters), and TRANSFORM (9 letters). REDO implies starting something over from the beginning, while REVAMP suggests making significant changes to something that already exists. TRANSFORM implies a more drastic alteration, such as changing something from one form to another. All three words suggest a complete change in the original form of something.