toilet tissue vs bathroom tissue

toilet tissue and bathroom tissue both are nouns.

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

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

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

Other synonyms of toilet tissue include toilet paper.

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