皇帝 (kōtei) means “emperor” | MotiTan Japanese Dictionary

More examples

博物館で古代ローマの皇帝の像を見ました。haku butsu kan de ko dai rō ma no kō tei no zō o mi ma shi ta

I saw a statue of an ancient Roman emperor at the museum.

Refers to the highest-ranking ruler of an imperial state, whose power covers multiple regions or peoples.

帝王teiō: A monarch who rules an empire or a large realm.
帝mikado: A formal term for a ruler of an empire, especially in historical contexts.

複数の地域や民族を支配する帝国の君主。fuku sū no chi iki ya min zoku o shi hai su ru tei koku no kun shu

皇帝 (kōtei) combines 皇 (kō, "imperial") with 帝 (tei, "sovereign"), using two Chinese-derived elements to express an imperial ruler.

The title Emperor is familiar to English speakers from Star Wars, where Emperor Palpatine represents the ruler of a vast fictional empire.