Copying string from one structure to another structure

I am trying to write a program that alphabetically sorts a small dictionary. To do this, I need to be able to copy strings from the unsorted dictionary to the sorted dictionary. If I try to copy an entire string as such:

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdbool.h>
#include <ctype.h>

struct entry
{
    char word[15];
    char definition[50];
};


void dictionarySort(struct entry dictionary[]) {
    int i;

    struct entry dictionary2[100] = {{}};

    for (i = 0; i <= strlen(&dictionary->word[0]); i++) {
        dictionary2[0].word[i] = dictionary[0].word[i];

    }
    dictionary2[0].word = dictionary[0].word;

    printf("%s\n",dictionary2[0].word);

}

int main (void) {
    struct entry dictionary[100] = 
    {{"aerie", "a high nest"},
    {"abyss", "a bottomless pit"},
    {"ahoy", "a nautical call of greeting"},
    {"addle", "to become confused"},
    {"aardvark", "a burrowing African mammal"},
    {"agar", "a jelly made of seaweed"},
    {"acumen", "mentally sharp; keen"},
    {"aigrette", "an ornamental cluster of feathers"},
    {"affix", "to attach"},
    {"ajar", "partially opened"}};
    dictionarySort(dictionary);
}

I get the following error message:

error: array type 'char [15]' is not assignable
        dictionary2[0].word = dictionary[0].word;
        ~~~~~~~~~~~~~~~~~~~ ^

On the other hand, if I copy individual characters, I have no way of differentiating the strings, which is necessary when dictionary2 is accessed.