<p>This is by far the largest and best developed classified dictionary of English that I am aware of. Unfortunately it does not include domains for concrete objects. I generally agree with its classification of English words, and have found its groupings and definitions very helpful. I have relied on it more than any other work. I highly recommend buying a copy of this book as an excellent example of a classified dictionary. It is designed as a tool for advanced learners of English. It has 1052 domains.</p>