Girth and Width

Girth noun - The distance around a round body.

Width is a synonym for girth in size topic. In some cases you can use "Width" instead a noun "Girth", when it comes to topics like circumference.

Width noun - An area over which activity, capacity, or influence extends.

Girth is a synonym for width in breadth topic. You can use "Girth" instead a noun "Width", if it concerns topics such as wideness.