roofing paper vs tar paper

roofing paper and tar paper both are nouns.

Word	Noun	Adjective	Verb	Adverb
roofing paper	Yes	No	No	No
tar paper	Yes	No	No	No

As nouns, roofing paper and tar paper are synonyms defined as:

roofing paper and tar paper: a heavy paper impregnated with tar and used as part of a roof for waterproofing

roofing paper (noun)	tar paper (noun)
a heavy paper impregnated with tar and used as part of a roof for waterproofing	a heavy paper impregnated with tar and used as part of a roof for waterproofing