def get_word_frequencies(word_list):
    """ Main method to create dictionary to contain unique words and their relative occurrences. """
    word_freqs = dict()             # Create empty word frequency histogram.
    for word in word_list:          # Loop over each word
        if word not in word_freqs:  # Add word as new histogram element if it doesn't already appear in histogram
            word_freqs[word] = 1
        else:                       # Increment word count if word already appears in histogram
            word_freqs[word] += 1
    return word_freqs               # Return frequency histogram

def sort_words_by_frequency(word_freqs):
    """ Main method to convert dictionary into sorted list of unique-word-to-word-frequency associations based on word occurrence. """
    word_freq_pairs = list(word_freqs.items())                      # Convert histogram into list of word-frequency pairs
    word_freq_pairs.sort(key=lambda items: items[1], reverse=True)  # Sort the list based on decreasing frequency rates
    return word_freq_pairs                                          # Return sorted list of word-frequency pairs

def grab_top_three_occurring_words(word_freq_pairs):
    """ Main method to return top three words by highest relative frequencies. """
    NUM_OF_WORDS = 3                                # Instantiate top number of words to pull from data
    for items in word_freq_pairs[:NUM_OF_WORDS]:    # Loop over top three word-frequency pairs in list
        print(items[0])                             # Return word in each item pair to user

# Final Print Statement of Top Three Words
grab_top_three_occurring_words(sort_words_by_frequency(get_word_frequencies(word_list)))