Swanneck is a term often used to describe a bend or curve in a material or structure that resembles the shape of a swan's neck. However, there are many synonyms for this term that can be used depending on the context and application. Some other common synonyms include necking, bottleneck, constriction, taper, and flaring. Each of these terms describes a different type of narrowing or shaping of a material or structure. For example, necking refers to a gradual reduction in diameter, whereas bottleneck implies a sudden and severe narrowing. Understanding these variations in terminology can be helpful when discussing materials science, engineering, or manufacturing processes.