Carbon paper and Carbon copy

Carbon paper noun - A thin paper coated on one side with a dark waxy substance (often containing carbon); used to transfer characters from the original to an under sheet of paper.

Carbon copy and carbon paper are semantically related. In some cases you can use "Carbon copy" instead a noun phrase "Carbon paper".

Carbon copy noun - Something or someone that strongly resembles another.

Carbon paper and carbon copy are semantically related. You can use "Carbon paper" instead a noun phrase "Carbon copy".