The 4000 English Words Essential for an Educated Vocabulary by Jeff Kolby. English offers perhaps the richest vocabulary of all languages, in part because its words are culled from so many languages. It is a shame that we do not tap this rich source more often in our daily conversation to express ourselves more clearly and precisely. Many a vocabulary book lists esoteric words we quickly forget or feel self-conscious using. However, there is a bounty of choice words between the common and the esoteric that often seem be just on the tip of our tongue. Vocabulary 4000 brings these words to the fore.