Board Thread:Off Topic/@comment-24464682-20160724234627/@comment-28256389-20160802091558

Main - X.

Pole - I.

Dude - OO.

Word - X.

Help - I.

Cube - O.

Null - O(I)O.

Hint - X.

Void - X.

Note : The word hasn't 2 identic letters in it.