China clay and Kaolin

China clay noun - A fine usually white clay formed by the weathering of aluminous minerals (as feldspar); used in ceramics and as an absorbent and as a filler (e.g., in paper).

Kaolin is a synonym for china clay. In some cases you can use "Kaolin" instead a noun phrase "China clay".

Kaolin noun - A fine usually white clay formed by the weathering of aluminous minerals (as feldspar); used in ceramics and as an absorbent and as a filler (e.g., in paper).

China clay is a synonym for kaolin. You can use "China clay" instead a noun "Kaolin".