title: If a string is present in the word, make it NA in python
body: <p>Suppose I have a list of words like,</p>
  
  <pre><code>c= ('an', 'abc', 'pls')
  </code></pre>
  
  <p>and then I have a column in dataframe,</p>
  
  <pre><code>df['column']
  
  another
  fan
  Ind
  abcd
  point
  plsea
  </code></pre>
  
  <p>I want to check if the value in the c is present in df['column'], I want to make it NA. The output I need to get is,</p>
  
  <pre><code>NA
  NA
  Ind
  NA
  point
  NA
  </code></pre>
  
  <p>The following are my tryings,</p>
  
  <pre><code>c in df['column']
  False
  </code></pre>
  
  <p>Getting only for the first row. Not able to do it. Can anybody help me in doing this?</p>