Synsets are near-synonyms for WordNets which represents words as lists
of the word senses that can be used to express the concept of the word.

University of Texas at San Antonio

WordNet is a large online thesaurus —a database that represents word senses—with versions in many languages. WordNet also represents relations between senses.

WordNet

An on-going but a helpful book resource about NLP
https://web.stanford.edu/~jurafsky/slp3/

Speech and Language Processing (3rd ed. draft) 

WordNets words contain gloss which is a dictionary style definition for the word.

Gloss

Synset

Fine-grained word senses in WordNets require labels for each synset with a lexicographic category drawn from a sematic field. These categories are supersenses, because of their specifc grouping of senses.

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