Kamu was here and wrote:

An additional aid in a ninjas' arsenal are the weapons they carry into battle. The normal weapon of a ninja consists of shuriken and kunai they carry in holsters on their body. In addition a ninja can utilize strength boosting pills to aid in battle or unique weapons they can use with exceptional deadliness.

Swords and Kunai are just the basics. Although, anything can become a weapon in the hands of a skilled Ninja--as they say, it's not the weapon but the one who wields it.