Google App Script for Highlight Words

highlight_words.gs

function highlight_words() {
  var doc   = DocumentApp.getActiveDocument();
  var words = ['DONE','WIP'];
  var styleDone = { [DocumentApp.Attribute.BACKGROUND_COLOR]:'#9bcb98' }; //light-green
  var styleWIP = { [DocumentApp.Attribute.BACKGROUND_COLOR]:'#ffc182' }; //light-orange
  var pgfs  = doc.getParagraphs();

  for (var word of words) for (var pgf of pgfs) {
    if (word === 'DONE') {
      var location = pgf.findText(word);
      if (!location) continue;
      var start = location.getStartOffset();
      var end = location.getEndOffsetInclusive();
      location.getElement().setAttributes(start, end, styleDone);
    }
    if (word === 'WIP') {
      var location = pgf.findText(word);
      if (!location) continue;
      var start = location.getStartOffset();
      var end = location.getEndOffsetInclusive();
      location.getElement().setAttributes(start, end, styleWIP);
    }
  }
}