From WordNet (r) 2.0 [wn]:
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
27 Moby Thesaurus words for "sharpener": ax, blade, cold steel, cutlery, cutter, dagger, edge tools, emery, file, grindstone, hone, knife, naked steel, novaculite, oilstone, pigsticker, point, puncturer, rubstone, steel, strap, strop, sword, toad sticker, whetrock, whetstone, whittle
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