Robert Mills is a name that can be synonymous with various other terms, depending on the context. In architecture, the term Classic Revivalist can be used as a synonym for Robert Mills, as he was well-known for designing neoclassical buildings. In history, Robert Mills can be replaced by terms like American architect, designer of the Washington Monument, one of the most influential architects of the 19th century, etc. Additionally, in memorial circles, Robert Mills could be referred to as "the father of American memorials" as he played a critical role in designing numerous renowned monuments in the country. Overall, Robert Mills is a name that carries several meanings, and each of these terms can be used to refer to Mills's accomplishments and legacy.