Merriam-Webster 
Not sure how to pronounce a word? This site from Merriam-Webster features a dictionary that gives you definitions and audio pronunciations of words! Want more? How about a thesaurus, word games, a word of the day feature, daily podcasts, and lots more!
Source: Merriam Webster Intended Audience: General Reading Level: Middle School Teacher Section: No Searchable: Yes
Read, Write, Think 
This site has reading, writing, grammar, and vocabulary lesson plans and online student interactives designed to support literacy learning in the K-12 classroom.
Source: International Reading Association and the National Council of Teacher of English Intended Audience: Students/Educators Reading Level: Elementary/Middle School Teacher Section: Yes Searchable: Yes
WordGirl
WordGirl is an animated series that follows the every day life and superhero adventures of “WordGirl” as she fights crime and enriches vocabulary usage. Disguised as mild-mannered 5th grader, Becky Botsford, WordGirl possesses superhero strength with the added benefit of a colossal vocabulary. The website for the series features games, activities, lesson plans and loads more.
Source: PBS Intended Audience: Kids Reading Level: Elementary School Teacher Section: Yes Searchable: No
My Vocabulary
This site is designed to enhance vocabulary mastery and written/verbal skills by focusing on words with Latin and Greek roots. You'll find word lists, thematic puzzles, lesson plans, vocabulary from works of literature and lots more!
Source: Vocabulary University Intended Audience: Students/Teachers Reading Level: Middle/High School Teacher Section: Yes Searchable: Yes
Lexipedia
Want to see a visual map of your word and its relationship to other words? This site creates a visual map showing antonyms, synonyms, and fuzzynyms(look it up!).
Source: Lexipedia Intended Audience: General Reading Level: Middle School Teacher Section: No Searchable: Yes
Word of the Day
What is today's word? Find out at this site from the NY Times, not only will you get anew word every day, you will get a link to the word used in the context of an article!
Source: NY Times Learning Network Intended Audience: Students Reading Level: Middle/High School Teacher Section: Yes Searchable: Yes
Vocabulary.com
This could be your one-stop-shop for all things vocabulary. You'll find links, quizzes, games, thematic vocabulary lists, lesson plans and more. Note: Some links will lead to fee-based resources.
Source: Vocabulary.com Intended Audience: General/Educators Reading Level: N/A Teacher Section: Yes Searchable: Yes
ESL Gold
This site has images and audio of common English words for the ESL student.
Source: ESL Gold Intended Audience: Students/Teachers Reading Level: N/A Teacher Section: No Searchable: No
GRE Vocabulary Builder
You can test yourself with online flashcards or print out lists of over 1400 words commonly used on the Graduate Record Exam (GRE) and then test yourself with an online exam.
Source: Soundkeepers Intended Audience: General Reading Level: High School Teacher Section: No Searchable: No
SAT Vocabulary Builder
You can test yourself with online flashcards or print out lists of over 4000 words commonly used on the SAT.
Source: Soundkeepers Intended Audience: Students Reading Level: High School Teacher Section: No Searchable: No
The Evolution of Languages
Learn more about how language evolved! You can learn the history and origins of words, learn where languages came from and loads more.
Source: Exploratorium Intended Audience: Students/Teachers Reading Level: Middle/High School Teacher Section: No Searchable: No
World Wide Words
This site traces the origins, history, and use of Englsih words from a British perspective.
Source: Michael Quinion Intended Audience: General Reading Level: High School Teacher Section: No Searchable: Yes
Online Etymological Dictionary
Wondering where a word came from? Check out this site! You can learn the etymology of English words, prefixes and suffixes, and more.
Source: Douglas Harper Intended Audience: General Reading Level: High School Teacher Section: No Searchable: Yes !
Word Spy
Want to keep up on the development of new words and phrases? Check out this blog from Paul McFedries.
Source: Paul McFedries Intended Audience: General Reading Level: High School Teacher Section: No Searchable: Yes
Glossarist
Looking for a glossary of nautical terms, how about a geometry glossary? Maybe you are looking for art terms. This site has catalogues and provided links to glossaries on the web.
Source: Woz, the Glossarist Intended Audience: General Reading Level: N/A Teacher Section: No Searchable: Yes
Ask Oxford
Do you know what exauctorate means? How about trammel? If you like words, this site from the Oxford Dictionaries will provide you with games, puzzles, history, and usage tips!
Source: Oxford University Press Intended Audience: General Reading Level: High School Teacher Section: No Searchable: Yes
An Etymological Dictionary of Classical Mythology
Check out this site that focuses on modern English words whose origins reach far back into Ancient Greek and Roman mythology.
Source: Elizabeth Wallis Kraemer Intended Audience: General Reading Level: High School Teacher Section: No Searchable: Yes
The Anagram Server
What do A RAG MAN, A NAG ARM, and MANA RAG all have in common, they are all anagrams for anagram. All you need to do at this site is type in a word and you'll get a list of anagrams.
Source: Wordsmith Intended Audience: General Reading Level: Middle School Teacher Section: No Searchable: No
