How are Herbs and Spices different from each other?
Love this question. I came upon the answer quite indirectly and by accident.
So, the short answer is herbs come from leaves and green stems; whiles spices come from seeds, bark, flowers, roots, and woody stems. I know that I’m still guilty of constantly calling ginger and cinnamon “herbs” but technically they are spices.
In terms of power or purpose difference, this answer is quite varied depending on the plant source.
This link brings a little more out as well as gives a small herb / spice listing.