Name ends in ult . Oxisol - ox from oxide. These have an oxic horizon, no argillic horizon. Oxisols are the most highly weathered soils, and are usually found in tropical regions. Oxisols are often bright red-orange.
Name ends in ox .
Vertisols have swelling clays and deep cracks when dry. When dry, surface soil falls into cracks and the soil slowly inverts itself. This mixing destroys horizon boundaries. Name end in vert . Aridisol - from arid, these are dry soils.