Preparation code

<script>
function loopReplace(input,toReplace){
  var i=0, r;
  while (r = toReplace[i++]) {
    while (input.indexOf(r) > -1) {
      input = input.replace(r, '');
    }
  }
  return input;
}

function regexReplace(input,toReplace){
  return input.replace(new RegExp(toReplace.join('|'),'g'), '');
}
</script>

Test runner

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loopReplace('aa ab ac ad ae af aa ag ah ai aa', ['aa','ab','ac','az']);

regexReplace('aa ab ac ad ae af aa ag ah ai aa', ['aa','ab','ac','az']);

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