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There are a number of different ways that you might approach that, but if you have a relatively short list of synonymous words/tokens, then you can use the "Replace Token" operator inside the "Process Documents" operator. It allows you to map a set of related tokens to a single token that represents the set. You can create as many entries as you want.
If you need something more complicated, there is a synonym finding operator from the Wordnet extension which is available for free in the RapidMiner marketplace.