Vocabulary:

    Total vocabulary has a remarkably high correlation (0.8-0.9) with IQ scores. There are several free tests available on the Internet to gauge your total vocabulary. One total-vocabulary test, the
WordSmart Challenge, may be downloaded from WordSmart. Their
Scoring Chart. equates a WordSmart score of 205 with a perfect score of 800 on the SAT, and assigns WordSmart scores of 209 to lawyers, 213 to college professors, 219 to editors, and 236 to major executives. I believe the 205 for an 800 on the SAT, but I don't believe those latter scores. The
Magus test is also free. Another good total-vocabulary test is
Peter Schmies' 600-Word Vocabulary Test. As anyone who's tried it can attest, this test has a very high ceiling. At the same time, there enough questions on the test that it covers a broad range of words. The top scorers on this test may be found at:
Peter's Great List of Literati.. I have provided
Definitions for the 600-Word Vocabulary Test, to spare the test-taker the onus of checking the definitions in a dictionary. A related vocabulary test which presents antonyms and synonyms is
Peter Schmies' Word Classification Test, can be taken online. A discussion of both these tests, including my scores and a score-distribution histogram, an estimation of its standard deviation, and a free dictionary/thesuarus containing the
10,000 Most Difficult Words is discussed at:
Word-Classification-Test Histogram and Standard Deviation.

    A more-thorough discussion of the role of vocabulary in intelligence measurement may be found at
the role of vocabulary in IQ testing , together with a discussion of vocabulary testing, and vocabulary augmentation