pyx chest vs pix chest

pyx chest and pix chest both are nouns.

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

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

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

Other synonyms of pyx chest include pix, pyx.

pyx chest (noun)	pix chest (noun)
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