Synonyms can be essential to provide perfectly matching results - especially for your focus keywords.
In this demo, there are a few synonyms defined for the following words:
- food - meal, cuisine
- car - vehicle, auto, automobile
- actor - artist, character
- movie - cinema, film, flick, show
Try any of these keywords, you should see very similar/overlapping results - even though the synonyms does not actually occur within those results anywhere.