Kaolin and Terra cotta

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).

Terra cotta and kaolin are semantically related in workable earth material topic. In some cases you can use "Terra cotta" instead a noun "Kaolin".

Terra cotta noun - A hard unglazed brownish-red earthenware.

Kaolin and terra cotta are semantically related in workable earth material topic. You can use "Kaolin" instead a noun phrase "Terra cotta".