proper noun/uˌnjon de reˌpublikas soθjaˌlistas soˈbjetikas/
Unión de Repúblicas Socialistas Soviéticas is feminine in Spanish.
Union of Soviet Socialist Republics (a former transcontinental country in Europe and Asia (1922–1991), now split into Russia and 14 other countries; short form Unión Soviética; abbreviation URSS)