Have you ever wondered about 7-letter words? Really wondered about them, we mean?
Let's consider these "lucky" words in relation to vowels and consonants, their constituent elements. It is easy enough to find specimens consisting solely of vowels or exclusively of consonants.
Borgmann, Dmitri A.
Word Ways: Vol. 1
, Article 5.
Available at: http://digitalcommons.butler.edu/wordways/vol1/iss3/5