Sentence:  Orion hit a rabbit once; but though sore wounded it got to the bury, and, struggling in, the arrow caught the side of the hole and was drawn out. Indeed, a <WSD>nail</WSD> filed sharp is not of much avail as an arrowhead; you must have it barbed, and that was a little beyond our skill. 
Meaning of the word marked with <WSD> tags:  A spike-shaped metal fastener used for joining wood or similar materials. The "nail" is generally driven through two or more layers of material by means of impacts from a hammer or other device. It is then held in place by friction.