孔洞

孔洞	kǒng dòng	small hole in an object
孔	Kǒng	surname Kong
孔	kǒng	hole / CL:个 / classifier for cave dwellings
洞	dòng	cave / hole / zero (unambiguous spoken form when spelling out numbers) / CL:个
洞	tóng	used in 洪洞, a county in Shanxi