When considering wood for making a sword, several factors come into play, including hardness, durability, availability, and workability. Here are a few woods commonly used for crafting wooden swords:

1. White Oak: White oak is a popular choice for crafting bokkens (wooden swords) due to its hardness, durability, and resistance to splintering. It provides a good balance of strength and flexibility, making it suitable for training purposes.
2. Hickory: Hickory is another hardwood known for its strength, density, and shock resistance. It is commonly used for making martial arts weapons, including wooden swords, due to its ability to withstand impact and its overall durability.
3. Hard Maple: Hard maple is a dense and strong wood that can be suitable for crafting wooden swords. It has good shock resistance and is less likely to splinter. However, it can be more challenging to work with due to its hardness.
4. Ash: Ash wood is known for its strength, resilience, and flexibility. It has been historically used for crafting tools and sporting equipment. While it may not be as dense as some other woods, it can still be suitable for making wooden swords.

It's important to note that the selection of wood also depends on the intended use of the wooden sword. If it is for decorative purposes or light training, you may have more flexibility in wood choice. However, if the sword will be subjected to rigorous training or impact, it's essential to choose a hardwood that can withstand the force without splintering or breaking.

Additionally, proper woodworking techniques, such as grain orientation, shaping, and finishing, can significantly impact the durability and performance of the wooden sword, regardless of the wood chosen.

Ultimately, it's recommended to consult with experienced woodworkers, martial arts instructors, or sword enthusiasts who have practical knowledge in crafting wooden swords to guide you in selecting the best wood for your specific needs and preferences.