The close and very significant relationship between knowledge of vocabulary and reading ability has long been recognized (q.v., Strang 1938, Davis 1944, Smith 1950, Klare 1963, Davis 1972). Perhaps Strang expressed this relationship most succinctly when she wrote: "Vocabulary is like the warp threads running through the entire developmental reading program. It is prerequisite to, as well as result of, effective reading."
Duffelmeyer, F. A. (1981). A Non-Traditional Technique for Testing Vocabulary. Reading Horizons, 21 (3). Retrieved from http://scholarworks.wmich.edu/reading_horizons/vol21/iss3/5