octad vs eighter from Decatur

octad and eighter from Decatur both are nouns.

Word	Noun	Adjective	Verb	Adverb
octad	Yes	No	No	No
eighter from Decatur	Yes	No	No	No

As nouns, octad and eighter from Decatur are synonyms defined as:

octad and eighter from Decatur: the cardinal number that is the sum of seven and one

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

octad (noun)	eighter from Decatur (noun)
the cardinal number that is the sum of seven and one	the cardinal number that is the sum of seven and one