diff --git a/contrib_bots/lib/thesaurus.py b/contrib_bots/lib/thesaurus.py
new file mode 100644
index 0000000..dc4983c
--- /dev/null
+++ b/contrib_bots/lib/thesaurus.py
@@ -0,0 +1,90 @@
+# See zulip/contrib_bots/lib/readme.md for instructions on running this code.
+from __future__ import print_function
+import sys
+import logging
+try:
+    from PyDictionary import PyDictionary as Dictionary
+except ImportError:
+    logging.error("Dependency Missing!")
+    sys.exit(0)
+
+#Uses Python's Dictionary module
+#  pip install PyDictionary
+
+def get_clean_response(m, method):
+    try:
+        response = method(m)
+    except Exception as e:
+        logging.exception(e)
+        return e
+    if isinstance(response, str):
+        return response
+    elif isinstance(response, list):
+        return ', '.join(response)
+
+def get_thesaurus_result(original_content):
+    search_keyword = original_content.strip().split(' ', 1)[1]
+    if search_keyword == 'help':
+        help_message = "To use this bot, start messages with either \
+                        @synonym (to get the synonyms of a given word) \
+                        or @antonym (to get the antonyms of a given word). \
+                        Phrases are not accepted so only use single words \
+                        to search. For example you could search '@synonym hello' \
+                        or '@antonym goodbye'."
+        return help_message
+    elif original_content.startswith('@synonym'):
+        result = get_clean_response(search_keyword, method = Dictionary.synonym)
+        return result
+    elif original_content.startswith('@antonym'):
+        result = get_clean_response(search_keyword, method = Dictionary.antonym)
+        return result
+
+class ThesaurusHandler(object):
+    '''
+    This plugin allows users to enter a word in zulip
+    and get synonyms, and antonyms, for that word sent
+    back to the context (stream or private) in which
+    it was sent. It looks for messages starting with
+    @synonym or @antonym.
+    '''
+
+    def usage(self):
+        return '''
+            This plugin will allow users to get both synonyms
+            and antonyms for a given word from zulip. To use this
+            plugin, users need to install the PyDictionary module
+            using 'pip install PyDictionary'.Use '@synonym help' or
+            '@antonym help' for more usage information. Users should
+            preface messages with @synonym or @antonym.
+            '''
+
+    def triage_message(self, message, client):
+        # return True if we want to (possibly) respond to this message
+
+        original_content = message['content']
+
+        is_thesaurus = (original_content.startswith('@synonym') or
+                        original_content.startswith('@antonym'))
+
+        return is_thesaurus
+
+    def handle_message(self, message, client, state_handler):
+        original_content = message['content']
+        original_sender = message['sender_email']
+        new_content = get_thesaurus_result(original_content)
+
+        if message['type'] == 'private':
+            client.send_message(dict(
+                type='private',
+                to=original_sender,
+                content=new_content,
+            ))
+        else:
+            client.send_message(dict(
+                type=message['type'],
+                to=message['display_recipient'],
+                subject=message['subject'],
+                content=new_content,
+            ))
+
+handler_class = ThesaurusHandler