Mary vs Blessed Virgin

Mary and Blessed Virgin both are nouns.

Word	Noun	Adjective	Verb	Adverb
Mary	Yes	No	No	No
Blessed Virgin	Yes	No	No	No

As nouns, Mary and Blessed Virgin are synonyms defined as:

Mary and Blessed Virgin: the mother of Jesus; Christians refer to her as the Virgin Mary; she is especially honored by Roman Catholics

Other synonyms of Mary include Madonna, The Virgin, Virgin Mary.

Mary (noun)	Blessed Virgin (noun)
the mother of Jesus; Christians refer to her as the Virgin Mary; she is especially honored by Roman Catholics	the mother of Jesus; Christians refer to her as the Virgin Mary; she is especially honored by Roman Catholics