This is the 3390th most frequent Japanese word.
欧
"欧" means "Europe" in Japanese.
In this sentence, "欧州" (Ōshū) refers to Europe as a geographical region.
彼は欧州で勉強しました。
He studied in Europe.
Here, "欧風" (Ōfū) utilizes the character "欧" to denote something associated with European style.
この絵は欧風のデザインです。
This painting has a European-style design.
In this context, "欧米" (Ōbei) combines "欧" for Europe with "米" for America, representing Western cultures in general.