autocratic

As a noun despotism

is government by a singular authority, either a single person or tight-knit group, which rules with absolute power, especially in a cruel and oppressive way.

As an adjective autocratic is

of or pertaining to autocracy or to an autocrat; absolute; holding independent and arbitrary powers of government.

As adjectives the difference between autocratic and ruthless

is that autocratic is of or pertaining to autocracy or to an autocrat; absolute; holding independent and arbitrary powers of government while ruthless is without pity or compassion; cruel, pitiless.

As an adjective autocratic

is of or pertaining to autocracy or to an autocrat; absolute; holding independent and arbitrary powers of government.

As a noun republic is

a state where sovereignty rests with the people or their representatives, rather than with a monarch or emperor; a country with no monarchy.

Certain is a related term of autocratic.

As adjectives the difference between certain and autocratic

is that certain is certain while autocratic is of or pertaining to autocracy or to an autocrat; absolute; holding independent and arbitrary powers of government.

As an adjective autocratic

is of or pertaining to autocracy or to an autocrat; absolute; holding independent and arbitrary powers of government.

As a noun dictator is

originally, a magistrate without colleague in republican ancient rome, who held full executive authority for a term granted by the senate (legislature), typically to conduct a war.

As adjectives the difference between bureaucratic and autocratic

is that bureaucratic is of or pertaining to bureaucracy or the actions of bureaucrats while autocratic is of or pertaining to autocracy or to an autocrat; absolute; holding independent and arbitrary powers of government.

As adjectives the difference between autocratic and aristocratic

is that autocratic is of or pertaining to autocracy or to an autocrat; absolute; holding independent and arbitrary powers of government while aristocratic is aristocratic.

As adjectives the difference between autocratic and authoritative

is that autocratic is of or pertaining to autocracy or to an autocrat; absolute; holding independent and arbitrary powers of government while authoritative is arising or originating from a figure of authority.

As adjectives the difference between tyrannical and autocratic

is that tyrannical is (not comparable) of, or relating to tyranny or a tyrant while autocratic is of or pertaining to autocracy or to an autocrat; absolute; holding independent and arbitrary powers of government.