boxcars vs XII

boxcars and XII both are nouns.

Word	Noun	Adjective	Verb	Adverb
boxcars	Yes	No	No	No
XII	Yes	No	No	No

As nouns, XII is a hypernym of boxcars; that is, XII is a word with a broader meaning than boxcars:

boxcars: (usually plural) an expression used when two dice are thrown and both come up showing six spots
XII: the cardinal number that is the sum of eleven and one

Other hypernyms of boxcars include 12, dozen, twelve.

boxcars (noun)	XII (noun)
(usually plural) an expression used when two dice are thrown and both come up showing six spots	the cardinal number that is the sum of eleven and one