WordNets words contain gloss which is a dictionary style definition for 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) 

Gloss

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.

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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