A biplane part is a STRUT, which is a five-letter word. STRUTS are structural members used to support and brace the wings of a biplane. Another biplane part is STRUTS, which is a six-letter word. STRUTS are metal rods that connect the wings to the fuselage of the aircraft. A third biplane part is multilevel, which is a ten-letter word. Multilevel refers to the two sets of wings on a biplane, which are stacked one above the other. Another biplane part is Ohio, which is a four-letter word. Ohio is the name of a type of wing STRUT used on some biplanes. Another biplane part is SPAD, which is a four-letter word. SPAD stands for Societe Pour L'Aviation et ses Derives, a French aircraft manufacturer that produced biplanes in the early 20th century. The last biplane part is AVIATE, which is a six-letter word. AVIATE means to fly or operate an aircraft, such as a biplane. Finally, a biplane part is propshaft, which is a nine-letter word. Propshaft is a shaft that connects the engine to the propeller of a biplane.