SearchWP has the ability to use keyword stems instead of the exact terms entered for search queries. Depending on your preference this can greatly enhance search results on your site.
Keyword stemming can be enabled when managing the settings for an Engine.
Take for example the verb run — if your content has terms such as running or runner a search for run will not return the same results set unless partial matching has been enabled.
If you would like the same results set to be returned for run, running, and runner SearchWP’s keyword stemming feature will make that happen.