The term 'wheelhouse' is a nautical term referring to the AREA of a ship where the wheel is located. It is also used to refer to an AREA of expertise or a person's strong suit. The crossword solutions for this term are 'SPHERE' (6 letters) and 'AREA' (4 letters). The term 'SPHERE' can be used to describe a round object, such as a wheel, and 'AREA' can refer to the space in which the wheel is located. Therefore, these two words together can be used to describe the wheelhouse of a ship.