imperium vs Russia

imperium and Russia both are nouns.

Word	Noun	Adjective	Verb	Adverb
imperium	Yes	No	No	No
Russia	Yes	No	No	No

imperium (noun)	Russia (noun)
supreme authority; absolute dominion	a former communist country in eastern Europe and northern Asia; established in 1922; included Russia and 14 other soviet socialist republics (Ukraine and Byelorussia and others); officially dissolved 31 December 1991
the domain ruled by an emperor or empress; the region over which imperial dominion is exercised	formerly the largest Soviet Socialist Republic in the USSR occupying eastern Europe and northern Asia
	a former empire in eastern Europe and northern Asia created in the 14th century with Moscow as the capital; powerful in the 17th and 18th centuries under Peter the Great and Catherine the Great when Saint Petersburg was the capital; overthrown by revolution in 1917
	a federation in northeastern Europe and northern Asia; formerly Soviet Russia; since 1991 an independent state