title: how to get synonyms of 2 tokens with wordnet
body: <p>I want to get the exact synonyms for'project management'. My code is the following:</p>
  
  <pre><code>from nltk.corpus import wordnet
  
  word = wordnet.synsets('project_management')
  print(word.lemma_names())
  </code></pre>
  
  <p>But it doesn't work. Any suggestions?</p>