Shirabe
  • Common
  • noun (common) (futsuumeishi)
Common Noun
English JMdict (multilingual)
1
noun (common) (futsuumeishi) word usually written using kana alone historical term soviet
from rus
2
noun (common) (futsuumeishi) word usually written using kana alone historical term abbreviation Soviet Union
I don't know about the USSR at all.

漢字 kanji used