hearts vs Black Maria

hearts and Black Maria both are nouns.

Word	Noun	Adjective	Verb	Adverb
hearts	Yes	No	No	No
Black Maria	Yes	No	No	No

As nouns, hearts and Black Maria are synonyms defined as:

hearts and Black Maria: a form of whist in which players avoid winning tricks containing hearts or the queen of spades

hearts (noun)	Black Maria (noun)
a form of whist in which players avoid winning tricks containing hearts or the queen of spades	a form of whist in which players avoid winning tricks containing hearts or the queen of spades