Gaelic is a term used to refer to a group of languages and dialects that are spoken in parts of Ireland, Scotland, the Isle of Man, and Brittany. IRISH (5 letters) is the most widely spoken Gaelic language, and is the official language of the Republic of Ireland. CELTIC (6 letters) is a related language family that includes IRISH, Scottish Gaelic, Manx, and Breton. ERSE (4 letters) is an archaic term for IRISH, while Lrse (4 letters) is an archaic term for Scottish Gaelic.