pix vs pyx chest

pix and pyx chest both are nouns.

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

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

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

Other synonyms of pix include pix chest, pyx.

pix (noun)	pyx 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