Otto Wagner was a famous Austrian architect known for his contributions to the Art Nouveau movement. Some synonyms for his name could include "Vienna Secessionist," as he was closely associated with the group, or "modernist architect," as he was known for incorporating innovative techniques and materials into his designs. Other terms that could be used to describe Wagner's style include "Ornamentfrei," meaning "free from ornamentation," and "functionalist," as he believed architecture should prioritize function over decoration. Finally, one could use the term "urban planner," as Wagner was also involved in city planning projects and advocated for the creation of modern infrastructure in Vienna.