Heavy Worsted?

What is the difference between a worsted weight and a heavy worsted weight yarn?

Maybe one st over a 4" width. They’re basically the same weight.

Here’s a yarn weight table that might help. Worsted is 16-20 st per inch so I imagine heavy worsted is at the 16 end of the scale. :think:

http://www.yarnstandards.com/weight.html