Multi-word synonyms match by sequence expression, meaning they must be in the correct order with nothing in-between.
For example, assuming you have a synonym pair HD ⇔ High Definition and a query HD, that query:
- Only matches records containing High Definition in that exact order
- Doesn’t match records containing High degree Definition or Definition High.
An alternative solution here would be to create a Rule to rewrite the query “High Definition” instead of the synonym. Please check out our documentation on Rules here keeping the Replace Word consequence in mind. This way the query HD will match records that have both "High" and "Definition", without these words needing to be in the correct order.