china clay vs kaoline

china clay and kaoline both are nouns.

Word	Noun	Adjective	Verb	Adverb
china clay	Yes	No	No	No
kaoline	Yes	No	No	No

As nouns, china clay and kaoline are synonyms defined as:

china clay and kaoline: 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)

Other synonyms of china clay include china stone, kaolin, porcelain clay, terra alba.

china clay (noun)	kaoline (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)	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)