Question

a person or thing who taking the place of another

Answer 1

u can col it a replacement

Answer 2

Answer:

One word substitution tests our ability to express the meaning of a phrase or a clause in a single word. These tests are helpful in determining the vocabulary and communication skills of an individual.

Cambridge English Dictionary defines 'substitute' as 'a thing or person that is used instead of another thing or person.'

So, one word substitution of 'a person or thing who taking the place of another ' is substitute.