"Tax gene" refers to a gene associated with the regulation and functioning of taxes. While there are no direct synonyms for this specific term, related terms can be used to describe aspects and concepts associated with taxes. For example, one may use words like "taxation gene" to emphasize the connection between the gene and the process of taxation. Alternatively, terms such as "revenue gene" or "finance gene" can be employed to convey the gene's association with economic aspects, such as the generation of funds or financial systems. Overall, these alternatives can help to contextualize and expand upon the meaning of "tax gene".