refractory pot vs cupel

refractory pot and cupel both are nouns.

Word	Noun	Adjective	Verb	Adverb
refractory pot	Yes	No	No	No
cupel	Yes	No	No	No

As nouns, refractory pot and cupel are synonyms defined as:

refractory pot and cupel: a small porous bowl made of bone ash used in assaying to separate precious metals from e.g. lead

Other synonyms of refractory pot include bone-ash cup.

refractory pot (noun)	cupel (noun)
a small porous bowl made of bone ash used in assaying to separate precious metals from e.g. lead	a small porous bowl made of bone ash used in assaying to separate precious metals from e.g. lead