A website for a dictionary is a tool which allows users to search for various words and their definitions in one location. Some websites offer extra tools such as a thesaurus, translation tools, or a feature called the word of the day to help people learn English. The top dictionaries come with a variety of features that can be used by a wide variety of users. They are also designed to be entertaining for children.
The Free Dictionary is a excellent example of an online dictionary that provides many different options, including a thesaurus, voice pronunciations, and an intransitive verbs translator. It provides a comprehensive list of synonyms, antonyms and other terms and lets you save searches with its Power Thesaurus. The site is pretty basic, but worth a look.
Another online dictionary that provides plenty of options is Macmillan Dictionary. This dictionary has synonyms, analogues, and examples of colloquial usage. It concentrates on 7,500 terms that are used the most in English. It also lets you submit new words and phrases to its crowdsourced Open Dictionary. It does not have the same number of idioms or phrasalverbs as other dictionary databases.
Visuwords is a web-based graphical dictionary, produces diagrams that show the relationship between words. This is a unique option that can be very helpful in understanding difficult English words.