alter a more formal word for ‘change’: His election could alter the balance of power in the region.
adjust to change something slightly so that it is exactly the way you want it: You adjust the volume using the remote control. ♦ Can you adjust the height of the seat?
adapt to change something to deal with a specific situation: The recipes can be adapted for vegetarians. ♦ They need to adapt their military forces to the needs of the post-Cold War situation.
convert to change something so that it can be used for a different purpose: We’re going to convert the spare room into a study.
modify to make small changes, for example to a machine or system, in order to make something suitable for a different situation: The exhaust system has to be modified to meet new emission standards.
transform to change something completely so that it looks or works much better: Putting in a larger kitchen has completely transformed the house. ♦ new discoveries that could transform the way we treat cancer
vary to make continuous or repeated changes to something: It’s important to vary your diet.