//Xml Structure
<?xml version="1.0" encoding="utf-8"?>
<News>
<Link>
<Summary>...</Summary>
</Link>
</News>

//load xml
var result = XDocument.Load(mypathlocal);

//group and count words
//stringlist is combined xml node values.
var PopWords1 = PopWords1_stringlist.GroupBy(x => x)
            .Select(x => new { x.Key, Count = x.Count() })
            .OrderByDescending(x => x.Count).ToList();

//try to get count of Link every PopWord
//for example: "Trump" word contains 5 Link at least one times
foreach(var value in PopWords1)
{

}