pyx chest vs pix

pyx chest and pix both are nouns.

Word	Noun	Adjective	Verb	Adverb
pyx chest	Yes	No	No	No
pix	Yes	No	No	No

As nouns, pyx chest and pix are synonyms defined as:

pyx chest and pix: a chest in which coins from the mint are held to await assay

Other synonyms of pyx chest include pix chest, pyx.

pyx chest (noun)	pix (noun)
a chest in which coins from the mint are held to await assay	any receptacle in which wafers for the Eucharist are kept
	a chest in which coins from the mint are held to await assay