The Japanese noun 'バイク (ばいく)' refers to a motorcycle. This term is commonly used in everyday conversation to describe a two-wheeled motor vehicle. It is important to note that while 'バイク' specifically refers to motorcycles, it is sometimes colloquially used to refer to bicycles in certain contexts, though this usage is less common and can be considered informal. Example sentences: I ride a motorcycle to work「私はバイクで仕事に行きます」(わたしはばいくでしごとにいきます). He bought a new motorcycle「彼は新しいバイクを買いました」(かれはあたらしいばいくをかいました).