toilet tissue vs toilet paper

toilet tissue and toilet paper both are nouns.

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

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

toilet tissue and toilet paper: a soft thin absorbent paper for use in toilets

Other synonyms of toilet tissue include bathroom tissue.

toilet tissue (noun)	toilet paper (noun)
a soft thin absorbent paper for use in toilets	a soft thin absorbent paper for use in toilets