Here''s one difference A rap is a quick, sharp sound, eg the noise you would hear if you used your knuckles on my front door to get me to open it. A knock can be a rap, but it can also sound different, eg if you hit my front door with your fist. Clive
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CliveA knock can be a rap, but it can also sound different, eg if you hit my front door with your fist.Wouldn't that be a thump ?