Regioselective is a term used to describe a type of chemical reaction that selectively targets one particular region of a molecule. Synonyms for this word include site-specific, location-specific, and region-specific. These terms are often used interchangeably to describe chemical reactions that selectively target a specific area or site within a molecule. In addition, the term regiospecific is also sometimes used to describe the same type of reaction. These terms are commonly used in the field of organic chemistry, where researchers are working to develop new methods for synthesizing complex molecules with specific structural features. Overall, these synonyms all describe the same concept of selectively targeting a particular region within a molecule during a chemical reaction.