Thesaurus
The thesaurus is a hierarchical list of one or more words that are linked with their:
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Broader terms (BT) like road and transport
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Narrower terms (NT) like sedan and station wagon
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Related terms (RT) like petrol, road, or highway
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Synonyms like vehicle, motor vehicle, or automobile
The terms you define are used when you do a thesaurus search.
You can use the search to:
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Expand a search with one word or phrase as criteria into many other relevant words or terms.
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Search for a concept, rather than a specific word.
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Expand a search to include common abbreviations or misspellings.