Some synonyms for the term "architectural ellipse" may include "oval design", "elliptical architecture", or "curved construction". Another potential synonym could be "circular structure", though this may not fully capture the unique properties and characteristics of an architectural ellipse. Depending on the context and intended meaning of the term, other synonyms could be "architectural curve", "architectural arc", or "rounded construction". Ultimately, the most appropriate synonym will depend on the specific use case and context in which the term is being employed.