As you may have noticed, above you will find words for "A subgroup of pyrobitumens rich in oxygen and partly soluble in alkali, resembling an earthy brown coal and probably representing a product of intense weathering of bitumens.". Hover the mouse over the word you'd like to know more about to view its definition. Click to find a better fitting word. Finally, thanks to ChatGPT, the overall results have been greatly improved.