pyx vs receptacle

pyx and receptacle both are nouns.

Word	Noun	Adjective	Verb	Adverb
pyx	Yes	No	No	No
receptacle	Yes	No	No	No

As nouns, receptacle is a hypernym of pyx; that is, receptacle is a word with a broader meaning than pyx:

pyx (noun)	receptacle (noun)
any receptacle in which wafers for the Eucharist are kept	a container that is used to put or keep things in
a chest in which coins from the mint are held to await assay	an electrical (or electronic) fitting that is connected to a source of power and equipped to receive an insert
	enlarged tip of a stem that bears the floral parts