Western-style sailboat
Refers to a sailing vessel of Western design, as opposed to traditional Japanese sailing ships.
港に大きな風帆船が停泊している。
A large Western-style sailboat is anchored in the harbor.
帆船 is a general term for any sailing ship, while 風帆船 specifically denotes a Western-style sailboat.
Compound of 風 (wind), 帆 (sail), and 船 (ship). The term likely arose to distinguish Western-style sailing vessels from traditional Japanese ones.