In Language on Vacation (Scribner's, 1965), Dmitri Borgmann mentions a class of words called "narrow" words. Narrow words are those in which all letters are written without any extensions (lines, loops or dots) either above or below the line, both in handwriting and lower-case type. For example, Borgmann instances OVERNERVOUSNESSES and OVERNUMEROUSNESSES as two long narrow words.
Word Ways: Vol. 6
, Article 15.
Available at: http://digitalcommons.butler.edu/wordways/vol6/iss3/15