Select the word from the following options that CANNOT be formed using the letters of the given word.

CATASTROPHE

Option (a): STAR $$\rightarrow$$​ word can be created from the given word.

Option (b): CASTOR $$\rightarrow$$ word can be created from the given word.

Option (c): TROPHY $$\rightarrow$$ word can not be created from the given word.

Because give word has no Y letter that's why it will not be formed.

Option (d): TRAP $$\rightarrow$$ word can be created from the given word. 

Thus, the correct option is (c)TROPHY.