Who knows? I tend to categorize wool more from the production/processing of the yarn point of view.
First the aminal - sheep, alpaca, llama, camel, goat, whatever
Then the processing - to remove lanolin, coat it, de-scale it, oil it, whatever. I guess in a simplistic form: oiled/unprocessed, washable and "standard". I'll use unprocessed wool for hunting/fishing gloves because the amount of lanolin and less processed fibers produces a very weather/water resistant fabric. It can be somewhat harsh to work with but the lanolin leaves my hands and cuticles soooo soft. I'll actually try to alternate projects because processed wool will dry out my cuticles. This is probably the wool that causes the most itchiness also, but, if you can tolerate, it's wonderful for bad weather.
Frends know gud humors when dey is hear it. ~ Da Crockydiles of ZZE.