We don't have synonyms for berretta yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are egretta, beretta and birretta.
(n) :
Archaic form of biretta. [A square cap, originally with four ridges across the top, surmounted by a tuft, worn by Roman Catholic clergy (and by some in the Anglican Church). A three-sided biretta is worn by Roman Catholic clergy for liturgical celebrations.]
(n) :
Archaic form of biretta. [A square cap, originally with four ridges across the top, surmounted by a tuft, worn by Roman Catholic clergy (and by some in the Anglican Church). A three-sided biretta is worn by Roman Catholic clergy for liturgical celebrations.]