Most of Chinese people cannot realize the different between cashmere and wool, because they have the similar pronunciation. As for now, I will list some different between cashmere and wool in my experience.
Firstly, they are from different animals. Cashmere is from goat, and wool is from sheep.
Secondly, it is different ways to get cashmere and wool. Workers use scissor to get the wool just like cutting hair. However, workers use iron comb to get cashmere carefully. And each sheep just produce less than 100g cashmere.
Furthermore, cashmere is much thinner than wool.
Lastly, the certifications are different. Cashmere feels soft and warmer that wool especially as clothes. What’s more, cashmere clothes cannot change the length.