books.google.com - This work goes back to the sources of modern English words and studies the development of vocabulary over time. It examines what constitutes a word, with a discussion of words that look and sound the same, words that have several meanings, and "words" that are made up of more than one "word". As well...http://books.google.com/books/about/Words_Meaning_and_Vocabulary.html?id=gzjnGTaa26oC&utm_source=gb-gplus-shareWords, Meaning and Vocabulary
