Let Flash Search know which search terms should be treated identically.
There are many synonyms that each person has a different way of calling them. For example, a "chair", some people call it a "chair", others call it a "sofa" or "seater" or "armchair"... This feature helps you manage those synonyms and process them when searched.
To create your synonym, go to Synonyms -> Create synonym
Enter your synonyms and click Save
Result: When you search for the word "seater", the products containing the word "chair" or "armchair" are also displayed.