gulag vs roundhouse

gulag

noun
  • A prison camp, especially one used to hold political prisoners. 

  • Also GULAG: the system of all Soviet labour camps and prisons in use, especially during the Stalinist period (1930s–1950s). 

  • A place where, or political system in which, people with dissident views are routinely oppressed. 

verb
  • To compel (someone) into a forced labour camp or a similar place of confinement or exile. 

roundhouse

noun
  • A circular prison, especially a small local lockup or station house. 

  • A prehistoric dwelling typical of northwest Europe in the Iron Age and Bronze Age. 

  • A circular building in which locomotives are housed. 

  • The uppermost room or cabin of any note upon the stern of a ship. 

  • A privy near the bow of a vessel, especially as reserved for officers. 

  • A punch or kick delivered with an exaggerated sweeping movement. 

  • In the game of pinochle, a meld consisting of a queen and king in each of the four suits. 

verb
  • To punch or kick with an exaggerated sweeping movement. 

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