A republic is a state or country that is not led by a hereditary monarch[1][2] but in which the people (or at least a part of its people)[3] have an impact on its government

Democracy is a form of government in which power is held indirectly by citizens in a free electoral system

Fascism is a radical, authoritarian and nationalist ideology.[1][2][3][4] Fascists advocate the creation of a single-party state.[5] Fascists believe that nations and races are in perpetual conflict whereby only the strong can survive by being healthy, vital, and by asserting themselves in combat against the weak.

In the 1920s democracy flourished, but the Great Depression brought disenchantment, and most of the countries of Europe, Latin America, and Asia turned to strong-man rule or dictatorships. Fascism and dictatorships flourished in Nazi Germany, Italy, Spain and Portugal, as well as nondemocratic regimes in the Baltics, the Balkans, Brazil, Cuba, China, and Japan, among others.[38]

a political theory advocating an authoritarian hierarchical government (as opposed to democracy or liberalism)

a form of socialism that abolishes private ownership
a political theory favoring collectivism in a classless society

a form of government whose head of state is not a monarch) "the head of state in a republic is usually a president"

democracy, republic, commonwealth (a political system in which the supreme power lies in a body of citizens who can elect people to represent them)

Communism
A system of government in which the state plans and controls the economy and a single, often authoritarian party holds power, claiming to make progress toward a higher social order in which all goods are equally shared by the people.
The Marxist-Leninist version of Communist doctrine that advocates the overthrow of capitalism by the revolution of the proletariat.

Fascism
A system of government marked by centralization of authority under a dictator, stringent socioeconomic controls, suppression of the opposition through terror and censorship, and typically a policy of belligerent nationalism and racism.
A political philosophy or movement based on or advocating such a system of government.
Oppressive, dictatorial control.

Democracy
Government by the people, exercised either directly or through elected representatives.
A political or social unit that has such a government.
The common people, considered as the primary source of political power.
Majority rule.

Republic
A political order whose head of state is not a monarch and in modern times is usually a president.
A nation that has such a political order.

Communism; a: a theory advocating elimination of private property b: a system in which goods are owned in common and are available to all as needed
2capitalized a: a doctrine based on revolutionary Marxian socialism and Marxism-Leninism that was the official ideology of the Union of Soviet Socialist Republics b: a totalitarian system of government in which a single authoritarian party controls state-owned means of production c: a final stage of society in Marxist theory in which the state has withered away and economic goods are distributed equitably d: communist systems collectively

Fascism; a political philosophy, movement, or regime (as that of the Fascisti) that exalts nation and often race above the individual and that stands for a centralized autocratic government headed by a dictatorial leader, severe economic and social regimentation, and forcible suppression of opposition
2: a tendency toward or actual exercise of strong autocratic or dictatorial control

Democracy;government by the people ; especially : rule of the majority b: a government in which the supreme power is vested in the people and exercised by them directly or indirectly through a system of representation usually involving periodically held free elections

Republic; a government having a chief of state who is not a monarch and who in modern times is usually a president (2): a political unit (as a nation) having such a form of government