expropriation vs arrogation

expropriation and arrogation both are nouns.

Word	Noun	Adjective	Verb	Adverb
expropriation	Yes	No	No	No
arrogation	Yes	No	No	No

As nouns, arrogation is a hypernym of expropriation; that is, arrogation is a word with a broader meaning than expropriation:

expropriation: taking out of an owner's hands (especially taking property by public authority)
arrogation: seizure by the government

Other hypernyms of expropriation include confiscation.

expropriation (noun)	arrogation (noun)
taking out of an owner's hands (especially taking property by public authority)	seizure by the government