pix vs pix chest

pix and pix chest both are nouns.

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

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

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

Other synonyms of pix include pyx, pyx chest.

pix (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