Synonymic query expansion is a technique of expanding a query with known synonyms before sending it to the search engine.It helps to bridge the semantic mismatch between user input and how data is written, improving the relevance of search results.Synonyms can be obtained from various sources like static dictionaries, manual synonym maps, LLMs, or search logs.A hybrid strategy combining keyword search, synonym expansion, and vector similarity can be an effective approach in enhancing search capabilities.