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?

Q) 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?

Answers:

• Spreading
• Dilating
• RSD (real time synonym detection)
• Stemming
• Branching