Synonyms for medical text search

I am trying to build a synonym list of medical terms for use in Elasticsearch. The purpose being to catch exceptions that wont conflate properly with the already implemented porter stemmer, for example none of the variants/synonyms of "anaesthesia" conflate to a common root. (This is an enterprise search solution for a corpus of medico-legal documents)

Does anyone know where I could access a synonym list of medical terminology. I have found Emerse (University of Michigan) have such a list, but academic licencing is $2500. I am conducting a 16 week MSc research project so this is beyond my scope and means. Thanks

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