sharpener
Word family
Longman Dictionary of Contemporary English 5++LDOCE 5++sharp·en·er /ˈʃɑːpənə, ˈʃɑːpnə $ ˈʃɑːrpənər, ˈʃɑːrpnər/ noun [countable] 
Da tool or machine for sharpening pencils, knives etc 磨削的工具〔如铅笔刀、磨刀器等〕Examples from the Corpus
sharpener• The Karisma Art Holder from Berol is a slick, functional pencil with a cleverly concealed sharpener, for artists and designers.• Also patron of infantrymen, knife sharpeners, swordsmiths, and weavers; he is invoked against gout.• I had a little sharpener to keep the points just right.• The crayons can be sharpened in an ordinary sharpener as long as it's designed to take the thicker pencils or crayons.• His leg sort of jams into the plastic like a pencil into a pencil sharpener.• He turned the sharpener slowly, keeping his eye on the lead.sharp·en·er nounChineseSyllable
etc pencils, tool for knives machine sharpening Corpus or a
sharpener
sharp‧en‧er /ˈʃɑːpənə, ˈʃɑːpnə $ ˈʃɑːrpənər, ˈʃɑːrpnər/
noun [countable]
a tool or machine for sharpening pencils, knives etc
sharp‧en‧er /ˈʃɑːpənə, ˈʃɑːpnə $ ˈʃɑːrpənər, ˈʃɑːrpnər/
noun [countable] Word Family: noun: sharpener, sharpness, sharp; adverb: sharp, sharply, sharpish; verb: sharpen; adjective: sharp
a tool or machine for sharpening pencils, knives etc