"RXN" is a common abbreviation used in the field of chemistry and refers to a chemical reaction. There are many synonyms for "RXN" that can be used in different contexts. One common synonym is "chemical reaction," while others include "reaction process," "reaction equation," and "reaction scheme." Some other synonyms include "chemical transformation," "chemical change," and "reaction rate." These synonyms can be useful when discussing different aspects of a chemical reaction, such as the mechanisms involved, the rate at which the reaction takes place, or the products formed. Using different synonyms for "RXN" can also help to add variety to scientific discussions and prevent redundancy.