pipeclay vs terra alba

pipeclay and terra alba both are nouns.

Word	Noun	Adjective	Verb	Adverb
pipeclay	Yes	No	No	No
terra alba	Yes	No	No	No

As nouns, pipeclay and terra alba are synonyms defined as:

pipeclay and terra alba: fine white clay used in making tobacco pipes and pottery and in whitening leather

pipeclay (noun)	terra alba (noun)
fine white clay used in making tobacco pipes and pottery and in whitening leather	finely pulverized gypsum used especially as a pigment
	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)
	fine white clay used in making tobacco pipes and pottery and in whitening leather