Blackfriar vs friar preacher

Blackfriar and friar preacher both are nouns.

Word	Noun	Adjective	Verb	Adverb
Blackfriar	Yes	No	No	No
friar preacher	Yes	No	No	No

As nouns, Blackfriar and friar preacher are synonyms defined as:

Blackfriar and friar preacher: a Roman Catholic friar wearing the black mantle of the Dominican order

Other synonyms of Blackfriar include Black Friar, Dominican.

Blackfriar (noun)	friar preacher (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