See example >>> https://stackoverflow.com/questions/5458605/first-word-selector

Define First Word and Last Word

function wrapFirstWord () { // This function for select first word.
    // Select only the first text node
    var node = $("div").contents().filter(function () { 
            return this.nodeType == 3;
        }).first(),

    // Get the text... 
        text = node.text(),

    // ... and the first word
        first = text.slice(0, text.indexOf(" "));

    if (!node.length)
        return;

    // Remove the first word from the text
    node[0].nodeValue = text.slice(first.length);

    // Add it back in with HTML around it
    node.before('<span>' + first + '</span><br/>');
};




// Another way to select First word and last word =========================
$("#lastWord").html(function(){ // Class or id can be use
  var text = $("#lastWord").text().trim().split(" "); // All text convert to array.
  var last = text.pop();  // Select last wrod.
  var first = text.shift(); // Select first word.

  var firstW = first.innerHTML = '<span class="firstWord">' + first + '</span>'; // Make wrapper of first wrod
  var lastW = last.innerHTML = '<span class="lastWord">' + last + '</span>'; // Make wrapper of last wrod.
    
  return firstW + " " + text.join(" ") + " " + lastW ;
});