C shuffle 2D array

Want to shuffle char *array and make elements random order

I read Shuffle array in C but for int

I try

const char *words = { "one", "two", "three", "four", "five", "six" }; 
for (int i=0; i<6; i++)
{
    int r = (rand() % (6 - i)) + i;

    int temp =  words[i];
    words[i] = words[r];
    words[r] = temp;
}

error though when iterate array words

please explain