Normal diameter is a term used to describe the regular or standard size of an object. However, there are multiple synonyms that can be used to describe this term. Some of the synonymous words for normal diameter include typical diameter, standard width, usual size, regular girth, and consistent dimension. These words are commonly used to express the average size or the expected size of an object. For instance, a normal diameter of a pipe would typically be expected to match industry standards. Synonyms can be helpful when trying to emphasize a specific point or when using language that is easily understandable to individuals with varying degrees of knowledge on the topic.