Wortschatz

Englishvocabulary
Listen to and use academic vocabulary in context. This website offers an Academic Word List (AWL) divided into 10 sublists of word families with gap-fill exercises for each group.
Learn Council
Word Games
ESLGold Vocab
Very good explanations with respective exercises.
ESLGold Idioms
Idioms, Phrasal Verbs, Slang, and Proverbs - with respective exercises.
Englisch-Hilfen
Improve your vocabulary
Languageguide
Learn vocabulary with pictures and their sound. Choose a topic and listen to the pronunciation of the words. Additionally, you can check your knowledge with the listening quizz
Freerice
Practice English synonyms with multiple choice exercises
Worldwidewords
Site for advanced learners; covers also recent words.