What is the name of the search engine technology due to which a query for the word ‘actor’ will also show search results for related words such as actress, acting or act?

Question:What is the name of the search engine technology due to which a query for the word ‘actor’ will also show search results for related words such as actress, acting or act?

1.Spreading

2.Dilating

3. RSD (realtime synonym detection)

4.Branching


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