Introducing synonyms and the below two papers.
- Query Rewriting using Automatic Synonym Extraction for E-commerce Search
http://ceur-ws.org/Vol-2410/paper20.pdf
- Unsupervised Synonym Extraction for Document Enhancement in E-commerce Search
https://assets.amazon.science/ba/2b/33b4140240049f3c8261d2ddcf2c/unsupervised-synonym-extraction-for-document-enhancement-in-ecommerce-search.pdf