The twenty words needed to complete this puzzle are mostly vowels. Even though thirteen of the words contain consonants, they are still more vowel than consonant. To prove the point and provide a hint at the same time, we have inserted all the consonants - all you must do is provide the vowels to complete thirteen words, and vowels to construct seven words from stem to stern.
Porter, Temple G.
Word Ways: Vol. 2
, Article 7.
Available at: http://digitalcommons.butler.edu/wordways/vol2/iss3/7