ogdoad vs octonary

ogdoad and octonary both are nouns.

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

As nouns, ogdoad and octonary are synonyms defined as:

ogdoad and octonary: the cardinal number that is the sum of seven and one

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

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