How Do I Compare Strings?

Hi, I'm trying to compare two strings in an array to see if they are equal.  However, I'm not quite sure on how to go about doing so.  The variables that hold the strings are "str" and "word", I'm not sure how to compare these two.  Please help me!

#include <stdlib.h>
#include <string.h>
#define WORD_COUNT 1000
int ReplaceString(char *inputstr, const char *oldstr, const char *newstr, int MaxSize);

int main(void)
{
  FILE *pf;
  char *cps;   //comma,period,colon
  char str[WORD_COUNT];
  int pos = 0;
  char *word[WORD_COUNT];
  char sep[]= ";.,";
  int i;
  int size = 0;

  pf = fopen("story.txt","r");
  if(!pf)
  {
    printf("Can't open the file\n");
    return 0;
  }
  while(fscanf(pf,"%s",str) == 1)
  {
    ReplaceString(str, ",", "", strlen(str));
    ReplaceString(str, ".", "", strlen(str));
    ReplaceString(str, ":", "", strlen(str));
    ReplaceString(str, ";", "", strlen(str));
    ReplaceString(str, "!", "", strlen(str));

    word[pos] = malloc(strlen(str) + 1);  //+1 is for Null b/c of strlen
    strcpy(word[pos], str);               //str = source, word=destination

    while(strcmp(word,str) !=0)     //--------------------not sure what to do next, increment word or str???

    pos++;
  }
  fclose(pf);
  return 0;
}

int ReplaceString(char *inputstr, const char *oldstr, const char *newstr, int MaxSize)
{
  char* p = NULL;
  int found = 0, InputStrLen, OldStrSize, NewStrSize, DiffSize, DiffSizeIfNewStrLarger;
  InputStrLen = strlen(inputstr);
  OldStrSize = strlen(oldstr);
  NewStrSize = strlen(newstr);
  DiffSize = OldStrSize - NewStrSize;
  DiffSizeIfNewStrLarger = (DiffSize * -1);

  while ( (p = strstr(inputstr, oldstr)) != NULL )
  {
    ++found;
    if (DiffSize > 0) memmove( p, p + DiffSize, strlen(p) + 1 );
    else if (DiffSize < 0)
    {
      InputStrLen += DiffSizeIfNewStrLarger;
      if (InputStrLen >= MaxSize)
        return -1;
      memcpy( p + (OldStrSize), p  + (OldStrSize) + DiffSizeIfNewStrLarger, strlen(p + (OldStrSize)) + 1 );
    }
    strncpy(p, newstr, NewStrSize);
  }
  return found;
}