tissue paper vs tissue

tissue paper and tissue both are nouns.

Word	Noun	Adjective	Verb	Adverb
tissue paper	Yes	No	No	No
tissue	Yes	No	Yes	No

As nouns, tissue paper and tissue are synonyms defined as:

tissue paper (noun)	tissue (noun)
a soft thin (usually translucent) paper	part of an organism consisting of an aggregate of cells having a similar structure and function
	a soft thin (usually translucent) paper

tissue paper (verb)	tissue (verb)
	create a piece of cloth by interlacing strands of fabric, such as wool or cotton