A website that is a dictionary is an online tool that allows users to search for different words and definitions all in one place. Some websites also provide additional tools like a thesaurus, a translation tool, and even a word of the day feature to help users learn English words. The best dictionary sites have numerous features to meet the requirements of a variety of users and are often designed to be fun for kids too.
The Free Dictionary is a excellent online dictionary which offers a number of different options such as a thesaurus voice pronunciations and an intransitive verbs translator. It has a comprehensive list of synonyms, antonyms and other terms and allows you to save searches using its Power Thesaurus. The site is basic, but worth a look.
Another online dictionary that provides plenty of options is Macmillan Dictionary. It includes analogues and synonyms as well as examples of colloquial use. It focuses on 7,500 words that are used the most in English. You can also submit new words and phrases for its crowdsourced Open Dictionary. It does not have as many idioms or phrasalverbs as other dictionary sources.
Visuwords is an interesting graphical online dictionary that generates diagrams of the relationships between words to show how they interact. This is a unique option that can be extremely helpful in understanding complex English words.