Decal and Transfer paper

Decal noun - Either a design that is fixed to some surface or a paper bearing the design which is to be transferred to the surface.

Transfer paper and decal are semantically related. In some cases you can use "Transfer paper" instead a noun "Decal".

Transfer paper noun - A paper that is coated with a preparation for transferring a design to another surface.

Decal and transfer paper are semantically related. Sometimes you can replace term "Decal" with "Transfer paper", this terms are similar.