Black Friar vs Dominican

Black Friar and Dominican both are nouns.

Word	Noun	Adjective	Verb	Adverb
Black Friar	Yes	No	No	No
Dominican	Yes	Yes	No	No

As nouns, Black Friar and Dominican are synonyms defined as:

Black Friar and Dominican: a Roman Catholic friar wearing the black mantle of the Dominican order

Other synonyms of Black Friar include Blackfriar, friar preacher.

Black Friar (noun)	Dominican (noun)
a Roman Catholic friar wearing the black mantle of the Dominican order	a Roman Catholic friar wearing the black mantle of the Dominican order
	a native or inhabitant of the Dominican Republic

Black Friar (adjective)	Dominican (adjective)
	of or relating to Saint Dominic or the Dominican order
	of or relating to or characteristic of the Dominican Republic or its people