totalitarianism vs authoritarianism

totalitarianism and authoritarianism both are nouns.

Word	Noun	Adjective	Verb	Adverb
totalitarianism	Yes	No	No	No
authoritarianism	Yes	No	No	No

As nouns, totalitarianism and authoritarianism are synonyms defined as:

totalitarianism and authoritarianism: a form of government in which the ruler is an absolute dictator (not restricted by a constitution or laws or opposition etc.)

Other synonyms of totalitarianism include absolutism, Caesarism, despotism, dictatorship, monocracy, one-man rule, shogunate, Stalinism, tyranny.

totalitarianism (noun)	authoritarianism (noun)
an ideological belief in the complete and unrestricted power of government.	a form of government in which the ruler is an absolute dictator (not restricted by a constitution or laws or opposition etc.)
a form of government in which the ruler is an absolute dictator (not restricted by a constitution or laws or opposition etc.)