load random word from 2 arrays and combine them in a single click

okay so I am trying to make a single call to load 1 word from 2 different arrays in javascript

so the end result would be "round bubble" or "aromatic things"

this is what I have

       <script type="text/javascript">
             function getDesc() {
             var descr = new Array["straight", "round", "aromatic");                          
             var randomChoice = Math.floor(Math.random()* descr.length)         
             }
             function getNoun() {
             var nouns = new Array("bubble", "office", "things");
             var randomChoice = Math.floor(Math.random()* nouns.length)         
             }

   function getWords() {
     getDesc();
     getNoun();
}
    </script>


       <div id="myBox">
       Words load here
       </div>

       <P>
         <a href="javascript:getWords()">Button</a>
       </p>