Two good online phonetic dictionaries are found at Merriam-Webster.com and Dictionary.com. Both of these online dictionaries are easy to search and browse, and both also include several added features.
In addition to its online dictionary and thesaurus, Merriam-Webster offers a medical dictionary. It also boasts a number of short word games, a Word of the Day, a blog, a Scrabble word finder and an English-to-Spanish translator.
Dictionary.com also includes a translator, a blog, word games and its own Word of the Day feature. Using a drop-down menu on the search bar, visitors can look up a word's synonyms and translations, as well as its definitions.