manhole cover
['odometer, hodometer, mileometer, milometer', 'harvester, reaper', 'shovel', 'hen-of-the-woods, hen of the woods, Polyporus frondosus, Grifola frondosa', 'bolete', 'chain saw, chainsaw', 'chain mail, ring mail, mail, chain armor, chain armour, ring armor, ring armour']