Koreas is a word used to describe the two countries located on the Korean Peninsula- North Korea and South Korea. There are various synonyms for this term that can be used according to context. Geographically, the term Korean Peninsula can be used to describe the area, whereas the term Korean or Koreanic language can be used to describe the language spoken in the Koreas. The term DPRK (Democratic People's Republic of Korea) can be used to describe North Korea specifically, and ROK (Republic of Korea) can be used to describe South Korea. Other terms include North Korean and South Korean, which can be used to describe people or things related to those countries. Ultimately, the synonym used should be chosen based on the context in which it will be used.