Some of the most reliable online dictionaries are those that are also published in print, such as the Merriam-Webster and Collins dictionaries and the Longman Dictionary of Contemporary English. Each of these websites has many additional features.
Aside from its online dictionary search tool, which allows users to look up words, pronunciations and example sentences, the Longman website (LDOCEonline.com) offers a word of the day feature to build users' vocabularies. It also charts words that have recently been trending.
The Merriam-Webster website (Merriam-Webster.com) also has a daily word feature, along with games, videos and a language blog. Topics for the blog have included the history of certain words and phrases as well as compilations of unusual and obscure vocabulary. Some other useful features at the Merriam-Webster website are its licensed Scrabble word finder and lists of commonly misspelled words, along with a thesaurus and medical dictionary.
The search tool at the Collins website (CollinsDictionary.com) enables users to toggle between British and American English, as well as to browse through dictionaries for other European languages, including French, German, Spanish and Italian. Like Merriam-Webster, the Collins website is geared for learners and is rich in additional features, including a thesaurus, translator and a variety of word games.