| Research-It | | Includes several dictionaries and a thesaurus as well as online tools for shipping and mailing, currency exchange, and language translation. |
| Skeptic's Dictionary | | Skeptical definitions and essays on occult, paranormal, supernatural and pseudoscientific ideas and practices with references to the best skeptical literature. |
| Strange Dictionaries | | Free online versions of the Dictionary of One-Letter Words, the Dictionary of All-Vowel Words, the Dictionary of All-Consonant Words, and other strange dictionary resources. |
| The Century Dictionary Online | | Free 500,000 word dictionary of English with an encyclopedia and world atlas. Uses DjVu and JPEG formats to display page images. Has headword lookup and full text search of 22 million words of underlying text. |
| The Glossarist | | Searchable directory of glossaries and topical dictionaries containing terms and definitions on hundreds of subjects. |
| The Online Dictionary List | | A large directory of online dictionaries, both in English and bilingual, including specialist dictionaries. |
| The Superhero Dictionary | | Each entry compares a superhero's name with its real life meaning and includes comparison pictures and pronunciations. |
| Voycabulary | | Online dictionary and thesaurus web linking lookup reference tool. |
| Web Dictionaries | | Multi-search tool by Tinh Van, which consults English-only dictionaries, and Vietnamese into English or French translation dictionaries. |
| Webster's Online Dictionary: The Rosetta Edition | | This database doubled with a metasearch tool extracts records from a variety of online and public-domain paper dictionaries, both general and specialized. It offers English definitions, as well as translations from/to a hundred languages. |
| Word Assault | | Looks up multiple words simultaneously using several databases including Webster's, Easton's, Wordnet, and the Devil's Dictionary. |
| Word Central | | Student dictionary and rhyming dictionary online at Merriam-Webster's website. Daily Buzzword by subscription. |
| Word Spy | | Site dedicated to recently coined words and existing words revived into modern usage. |
| WordWeb | | A free English thesaurus and dictionary for Windows. |
| Worthless Word for the Day | | Obscure, abstruse and/or recondite word, especially one not falling into medical terms, foreign monetary units, foreign units of measure, legal terms, or professional jargon of any type. |
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