Oak wood is a hardwood that comes from oak trees, which are native to the northern hemisphere:

NOTE—Oak is not a suitable option for cutting boards

Uses

Oak wood is commonly used for: 

Furniture 

Coasters

Cabinets

Benches

Signs

Laser Engraving

Holiday Decorations

Picture Frames

Gun Cases

Shelves

Maple wood is a hardwood with a number of characteristics, including:

Color

Maple wood can range in color from creamy white to reddish-brown, depending on the part of the tree and the growing region. The sapwood is usually creamy white, while the heartwood can vary from light to dark reddish brown.

Maple is known for its strength, density, and smooth grain. It can brighten a room in its natural state, but it can also be stained to look like other types of wood. Maple wood darkens over time due to exposure to oxygen and sunlight.

Maple wood is strong, shock resistant, and resistant to abrasion and wear. It's also durable, long-lasting, and has good resistance to decay. 

Uses

Cutting Boards

Furniture

Mucical Instrument

Baseball Batas

including any oak wood aplication as well

Walnut is a tough hardwood of medium density, Black walnut wood is dark, hard, dense and tight-grained. Although there are many varieties of walnut trees, just a handful are native to North America. Of them, the Eastern Black Walnut, also called the American Black Walnut or American Walnut, is the one typically used for woodworking.

Uses

Furniture

Cutting Boards (provides a great contrast with lighter woods like maple)

Kitchen Utensils

Cabinet Doors

Mucical Instruments

Including all applications where oak or maple woods are used.