title: Vim: word vs WORD
body: <p>I'm learning Vim and can't wrap my head around the difference between <code>word</code> and <code>WORD</code>.</p>
  
  <p>I got the following from the Vim manual.</p>
  
  <blockquote>
    <p>A word consists of a sequence of letters, digits and underscores, or a
    sequence of other non-blank characters, separated with white space
    (spaces, tabs, ).  This can be changed with the 'iskeyword'
    option.  An empty line is also considered to be a word.</p>
    
    <p>A WORD consists of a sequence of non-blank characters, separated with
    white space.  An empty line is also considered to be a WORD.</p>
  </blockquote>
  
  <p>I feel <code>word</code> and <code>WORD</code> are just the same thing. They are both a sequence of non-blank chars separated with white spaces. An empty line can be considered as both <code>word</code> and <code>WORD</code>.</p>
  
  <p>Question:<br>
  What's the difference between them?<br>
  And why/when would someone use <code>WORD</code> over <code>word</code>?</p>
  
  <p>I've already done Google and SO search, but their search-engine interpret <code>WORD</code> as just <code>word</code> so it's like I'm searching for <code>Vim word vs word</code> and of course won't find anything useful.</p>