self-government vs self-determination

self-government and self-determination both are nouns.

Word	Noun	Adjective	Verb	Adverb
self-government	Yes	No	No	No
self-determination	Yes	No	No	No

As nouns, self-government and self-determination are synonyms defined as:

self-government and self-determination: government of a political unit by its own people

Other synonyms of self-government include self-rule.

self-government (noun)	self-determination (noun)
government of a political unit by its own people	determination of one's own fate or course of action without compulsion
	government of a political unit by its own people