Old Irish is a language that was spoken in Ireland during the early medieval period. It has undergone many changes over the centuries and is now considered a dead language. There are several other terms that are used to describe this language depending on the context. Some of the synonyms for Old Irish include Early Irish, Primitive Irish, Ancient Irish, and Gaelic. These terms are often used interchangeably, but each has its own specific historical and cultural connotations. Regardless of the term used, Old Irish remains a fascinating and important part of Ireland's rich linguistic and cultural heritage.