controvert：反驳，否认，反证；辩论，讨论

词根词缀：contro-反对,相反 + -vert-转

• knocking shop
• knock-on
• knockout
• knock-up
• knoll
• knot
• knotty
• know
• know-all
• know-how
• knowingly
• knowledge
• knowledgeable
• known
• knuckle
• knuckle-dragger
• knuckleduster
• knucklehead
• knuckle sandwich
• koala
• koan
• Kobe
• kohl
• kohlrabi
• koi