ALL THE ANSWERS GIVEN ARE CORRECT I WILL JUST TRY TO ANSWER IT FROM ANOTHER WAY OF THINKING :-)
Approach : Observe that the code words dont have any vowel - HINT 1
The of code words ALPHABETS and the set of there meaning ALPHABETS (excluding vowels) are exactly the same - HINT 2
put this information in juicer mixer grinder (BRAIN) or i should say (NRB)
The the codeword is just the backward reading of there meaning without vowels.