substitute

noun1 of 2

person or thing that takes the place of something

• “I want you all to meet your new substitute teacher.”Tatoeba
• “I persuaded her to substitute for me in that job.”Tatoeba

Sentences from Tatoeba show real usage. A word can have several meanings, so a sentence may use another one.

verb2 of 2

To use in place of something else, with the same function.