“The term vocabulary, broadly defined, includes two categories: receptive and expressive. Receptive vocabulary includes all of the words that a person understands when listening or reading, but may or may not feel comfortable using in speech or writing. Expressive vocabulary includes all the words a person feels comfortable using in his or her own spoken or written communication”. (Dr. Taffy E. Raphael. Language and Culture faculty at the University of Illinois at Chicago).

Well, then…what is this???