
Hi @Milan Chauhan ,
Query spelling suggestions are words that appear below the search box as a user types a query. SharePoint automatically creates query suggestions from frequently entered queries that resulted in a click on a search result. For example, if you've repeatedly entered the query word "coffee" and then clicked a search result each time, "coffee" automatically becomes a query suggestion.
To create query suggestions in SharePoint search:
Go to More features in the SharePoint admin center, and sign in with an account that has admin permissions for your organization.
Under Search, select Open.
On the search administration page, select Query Suggestion Settings.
Open a text editor of your choice, and enter a list of terms that you want the system to always suggest to users. Only add one term per line to the text file, and don't mix languages in the text file.
Save the text file to a location that's accessible from SharePoint.
To import a list of query suggestions to SharePoint search, go to Always suggest phrases > Import from text file. When you import query suggestions, any existing ones will be overwritten.
Browse to the file that you want to import.
Go to Language for suggestion phrases, and select the processing language of your query suggestions. It should match the language of the terms in the text file.
Select Save Settings.
For more details, please refer to:
https://learn.microsoft.com/en-us/sharepoint/manage-query-suggestions
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