change

change 

to change something: alter, adapt, adjust, amend, modify, revise, vary  

to change a system or organization: restructure, reorganize, reform
  

to change something completely: transform, revolutionize
 

to change facts or information, or change what someone has said: twist, distort, misrepresent
 

easily changed: flexible, adaptable
 

impossible to change: fixed, final, irrevocable