This was an Americanism.
The word that doesn't belong is 'Synonyms'.
The word that doesn't belong with the other three is Synonyms as it is the subject being discussed in the question, whereas the other three words represent a choice of options from which one doesn't belong. Synonyms are words that have similar or the same meaning.
In this case, the question is asking for three words that are synonyms and one word that doesn't fit in. So, the word 'Synonyms' is the odd one out in this context.
#SPJ6
Answer:
I got 3rd Position in exam .
I wrote peom in compitition.
I changed the rule of the class.
I got the prize of mine success.
Answer:
We should not bother about helping him