Lexipedia

Lexipedia is an online visual semantic network with dictionary and thesaurus reference functionality. Lexipedia presents words with their semantic relationships displayed in an animated visual word web. Lexipedia supports English, Dutch, French, German, Italian, Spanish languages. (Source: Wikipedia)

You can hoover with mouse over words to view their definition, hear right pronunciation and usage within a sentence.

Each word type has it own color on the chart: nouns are red, verbs are orange, adverbs are green and adjective are blue.

Lexipedia is a useful tool in any classroom setting. It is an excellent place to increase your student's vocabulary and work understanding.

http://lexipedia.com/english