Group of lexical unit

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WordNet® is a large lexical database of English. Nouns, verbs, adjectives and adverbs are grouped into sets of cognitive synonyms (synsets), each expressing a distinct concept.

• https://uni-tuebingen.de/en/142806, A university account is required to use the online demo, and the license is only applied to academic purpose. See https://linguistics.stackexchange.com/questions/15471/germanltk-not-finding-files-python
• https://github.com/wroberts/pygermanet
• https://wordnet.princeton.edu/
• An open-accessed German WordNet can be found in http://compling.hss.ntu.edu.sg/omw/