can be defined as artificially bonded (by chemical/molecular alteration) non-metal earth materials; typically clay
Clay is broadly defined as a fine-grained earthy material that develops plasticity when mixed with water; in other words it is capable of being molded.
Temper is the aplastic filler used in clay to help control for shrinkage and to lower the required firing temperature. it allows water in the clay to escape more readily and this prevents or reduces cracking.
Together clay and temper constitute paste