LetterCountI.js

function LetterCountI(str) { 
  str = str.split(" ");
  var answer = "";
  var mostRep = 1;
  for (i = 0; i < str.length; i++)
    if (eachWord(str[i]) > mostRep) {
      mostRep = eachWord(str[i]);
      answer = str[i];
    }
  if (mostRep === 1)
    return -1;
  else 
    return answer;      
}

function eachWord(string) { 
  string = string.toLowerCase().split("").sort();
  var counter = 1;
  var most = 1;
  for (i = 1; i < string.length; i++) {
    if (string[i] === string[i - 1]) 
      counter++;
    else 
      if (counter > most) {
        most = counter;
        counter = 1;
      }
    if (i === string.length - 1)
      if (counter > most) 
        most = counter; 
  }
  return most;
}

console.log(LetterCountI("heey brew"));