Hi Peter,
You have multiple options, the most convenient is probably the predictive result suggestions: https://documentation.ajaxsearchpro.com/autocomplete-and-keyword-suggestions/keyword-suggestions#results-suggestions
The plugin will try a different keyword from the given sources, which looks the most similar to the typed in keyword.
Another great option is to use keyword synonyms. It’s a very powerful feature, and works globally with every item indexed.
In your case the Synonyms may actually fit better, if you are aware of the words. You can even use both of the features for the best output.