commissary vs PX

commissary and PX both are nouns.

Word	Noun	Adjective	Verb	Adverb
commissary	Yes	No	No	No
PX	Yes	No	No	No

As nouns, PX is a hyponym of commissary; that is, PX is a word with a more specific, narrower meaning than commissary:

commissary: a retail store that sells equipment and provisions (usually to military personnel)
PX: a commissary on a United States Army post

Other hyponyms of commissary include post exchange, slop chest, small stores.

commissary (noun)	PX (noun)
a retail store that sells equipment and provisions (usually to military personnel)	a commissary on a United States Army post
a snack bar in a film studio