substitute
US /ˈsʌbstɪˌtut, -ˌtjut/
・UK /'sʌbstɪtju:t/
B2
verb
- To perform the tasks instead of someone else
- To replace one person or thing for another
noun
- A person or thing acting in place of another
Examples
The television is a poor substitute for human companionship.
There's no substitute for hard work.