title: How to add extra stop words in addition to default stopwords in wordcloud?
body: <p>I would like to add certain words to the default stopwords list used in wordcloud. Current code:</p>
  
  <pre><code>all_text = " ".join(rev for rev in twitter_clean.text)
  stop_words = ["https", "co", "RT"]
  wordcloud = WordCloud(stopwords = stop_words, background_color="white").generate(all_text)
  plt.imshow(wordcloud, interpolation='bilinear')
  plt.axis("off")
  plt.show()
  </code></pre>
  
  <p>When I use the custom stop_words variable, words such as "is", "was" , and "the" are all interpreted and displayed as high frequency words. However,  when I use the default stopwords list (no stopwords argument) then there are many other words that are displayed as highly frequent. How do I add my custom stop_words variable along with the default stopwords list to my wordcloud?</p>