OpenWordNet uses the public domain WordNet files to build a English dictionary / thesaurus. For a given word, the various meanings and examples are listed with the associated part of speech. For each meaning, the corresponding relationships (word and meaning) for a selected meaning, are shown with usage examples and part of speech. For each relationship, further meanings and relationships can be extracted to explore the meaning hierarchy.
OpenWordNet is an offline ad-free version of the WordNet dictionary / thesaurus