更换 (gēnghuàn) means 'to replace' and is used for swapping out a worn-out or broken item (e.g., tires, faucets) or updating details (e.g., address, phone number). It is more concrete and physical than 代替 (dàitì 'to substitute'), which can refer to taking the place of a person or abstract function. 替换 (tìhuàn 'to replace, substitute') is closer in meaning but emphasizes exchanging one item for another in a set.