agnatic

As a noun cognac

is a brandy distilled from white wine in the region around Cognac in France.

As a proper noun Cognac

is a city in the Charente département of France, famous for cognac brandy.

As an adjective agnatic is

of the male bloodline; patrilineal.

As adjectives the difference between agnathic and agnatic

is that agnathic is jawless while agnatic is of the male bloodline; patrilineal.