Soviet vs socialist

Soviet

adj
  • Supporting or representing the Soviet Union or Sovietism; Sovietist. 

  • Pertaining to the Soviet Union or its constituent republics. 

noun
  • A citizen of the Union of Soviet Socialist Republics. 

socialist

adj
  • Of, relating to, supporting, or advocating socialism. 

noun
  • One who supports or advocates socialism. 

How often have the words Soviet and socialist occurred in a corpus of books? (source: Google Ngram Viewer )