- Visuwords online graphical dictionary
This is an online graphical dictionary linked to Princeton University’s WordNet. It shows word families – words with similar meanings and forms – which are linked together using coloured diagrams and mind maps.
- Vocabulary workshop: Roots, prefixes and suffixes
Comprehensive lists clarifying the meanings of prefixes, suffixes and root forms. The site also gives example sentences and has some interesting exercises, most of the examples relate to an academic context.