pyx vs pix chest

pyx and pix chest both are nouns.

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

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

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

Other synonyms of pyx include pix, pyx chest.

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