decal vs transfer paper

decal and transfer paper both are nouns.

Word	Noun	Adjective	Verb	Adverb
decal	Yes	No	No	No
transfer paper	Yes	No	No	No

As nouns, transfer paper is a hypernym of decal; that is, transfer paper is a word with a broader meaning than decal:

decal: 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: a paper that is coated with a preparation for transferring a design to another surface

Other hypernyms of decal include design, figure, pattern.

decal (noun)	transfer paper (noun)
either a design that is fixed to some surface or a paper bearing the design which is to be transferred to the surface	a paper that is coated with a preparation for transferring a design to another surface