VIII vs ogdoad

VIII and ogdoad both are nouns.

Word	Noun	Adjective	Verb	Adverb
VIII	Yes	No	No	No
ogdoad	Yes	No	No	No

As nouns, VIII and ogdoad are synonyms defined as:

Other synonyms of VIII include 8, eight, eighter, eighter from Decatur, octad, octet, octonary.

VIII (noun)	ogdoad (noun)
the cardinal number that is the sum of seven and one	the cardinal number that is the sum of seven and one