toilet paper vs toilet tissue

toilet paper and toilet tissue both are nouns.

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

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

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

Other synonyms of toilet paper include bathroom tissue.

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