eightvo vs octavo

eightvo and octavo both are nouns.

Word	Noun	Adjective	Verb	Adverb
eightvo	Yes	No	No	No
octavo	Yes	No	No	No

As nouns, eightvo and octavo are synonyms defined as:

eightvo and octavo: the size of a book whose pages are made by folding a sheet of paper three times to form eight leaves

Other synonyms of eightvo include 8vo.

eightvo (noun)	octavo (noun)
the size of a book whose pages are made by folding a sheet of paper three times to form eight leaves	the size of a book whose pages are made by folding a sheet of paper three times to form eight leaves