How to add an element from an xml file to an xml document

I have a dictionary that I'm serializing and I'm trying to add the root element to a new xml document.

New XML Document looks like this:

<?xml version="1.0" encoding="utf-8"?>
<WordList>
  <IgnoredWords />
</WordList>

My xml file looks something like this:

<?xml version="1.0" encoding="utf-8"?>
<MisspelledWords xmlns:xsi="http://ift.tt/ra1lAU" xmlns:xsd="http://ift.tt/tphNwY">
   <word>
       <Suggestions/>
       <Locations>   
           <Location>
              <FileName/>
              <LineNumber/> 
              <OriginalLine/>
           </Location> 
       </Locations>   
   <word>
</MisspelledWords>

Here is what I'm trying to do in C#:

    xmlWordListDoc.Save("wordlist.xml");

    XmlTextReader xmlTextReader1 = new XmlTextReader("misspelledwords.xml");
    XmlDocument xmlMisspelledWordsDoc = new XmlDocument();
    xmlMisspelledWordsDoc.Load(xmlTextReader1);
    xmlTextReader1.Close();
    XmlNode misspelledWords = xmlMisspelledWordsDoc.SelectSingleNode("/MisspelledWords");

    XmlTextReader xmlTextReader2 = new XmlTextReader("wordlist.xml");
    XmlDocument wordlistDoc = new XmlDocument();
    wordlistDoc.Load(xmlTextReader2);
    xmlTextReader2.Close();
    wordlistDoc.AppendChild(misspelledWords);

    wordlistDoc.Save("wordlist.xml");

Thank you for any help you can give.