"RISR" stands for "Research Institute for Sustainable Roads". When it comes to finding synonyms for the word "RISR", there are a few options to consider. One possible synonym for "RISR" could be "research center", as both refer to facilities dedicated to furthering knowledge and understanding in a particular field. Another synonym could be "sustainability institute", which highlights the focus on sustainable practices in road construction and maintenance. "Road research center" could also be a potential synonym, emphasizing the specific focus on road-related issues. Ultimately, the choice of synonym depends on the context and intended emphasis of the phrase.