octonary

As nouns the difference between octonary and null

is that octonary is a group of eight things while null is zero, nil; the cardinal number before einn.

As an adjective octonary

is of eighth rank or order.

As nouns the difference between taxonomy and octonary

is that taxonomy is the science or the technique used to make a classification while octonary is a group of eight things.

As an adjective octonary is

of eighth rank or order.