Oslo(Oslo (a county and municipality, the capital city of Norway)) proper noun [UK: ˈɒz.ləʊ] [US: ˈɑːzlo.ʊ]Oslo is the capital of Norway. = Oslo är Norges huvudstad.
Tjeckoslovakien proper noun {n}
Czechoslovakia(former country in Central Europe) proper noun [UK: ˌtʃek.əʊ.slə.ˈvæk.ɪə] [US: ˌtʃeko.ʊ.slə.ˈvæk.ɪə]