Bent spear can be replaced by various synonyms such as "broken spear," "defective spear," "faulty spear," or "twisted spear." All of these synonyms describe a spear that has been damaged or altered from its original state, making it less effective as a weapon. Another synonym for bent spear could be "warped spear," which indicates that the weapon has been altered due to heat or moisture. "Bent lance" is another synonym that could be used interchangeably with bent spear. Regardless of the specific synonym used, all convey the idea that the spear is no longer in its proper form and is not fit for use in battle or combat.