Closed list entities allow you to provide synonyms different ways of spelling for one or multiple entities so that there is no need to add all utterances that use these entities separately. For example, New York is often referred to as NYC, The Big Apple and Gotham, whereas Los Angeles is often referred to as L.A. or the City of Angels. By creating a Closed list entity named 'City' we can add New York and Los Angeles as canonical forms together with their synonyms in the utterances field. The Natural Language Processing (NLP) engine will only grasp the predefined values of the closed list entity.