Here are some of our favorite links
http://grammar.quickanddirtytips.com/
www.bartleby.com
www.verbivore.com
www.wolinskyweb.net/word.htm
www.word-detective.com
www.wordcourt.com
www.m-w.com
www.dictionary.cambridge.org
www.oed.com
www.dictionary.com
www.yourdictionary.com
www.visualthesaurus.com
All your questions answered!
Reference sources
Reference sources and related links
Links to word sites
Word features
Word features and origins
Merriam-Webster Dictionary
Cambridge Dictionary
Oxford English Dictionary
Dictionaries and thesauruses
Visual thesauruses