The term "tainter" is a relatively obscure word that typically refers to a person or thing that is soiled, corrupted, or contaminated. Synonyms for this word, therefore, would include words like tainted, polluted, corrupted, infected, defiled, and blemished. Other options might include words like spoiled, marred, tainted, or damaged. Depending on the context, other possible synonyms could include words like impure, unclean, or contaminated. In general, when looking for synonyms for this word, it is always helpful to consider the context and intended meaning of the word, in order to choose the most appropriate alternative.