government vs regime

government and regime both are nouns.

Word	Noun	Adjective	Verb	Adverb
government	Yes	No	No	No
regime	Yes	No	No	No

As nouns, government and regime are synonyms defined as:

government and regime: the organization that is the governing authority of a political unit

Other synonyms of government include authorities.

government (noun)	regime (noun)
the act of governing; exercising authority	(medicine) a systematic plan for therapy (often including diet)
(government) the system or form by which a community or other political unit is governed	the organization that is the governing authority of a political unit
the study of government of states and other political units
the organization that is the governing authority of a political unit