cylindrical vs spheroidal

cylindrical

adj
  • Shaped like a cylinder. 

  • Describing a map projection in which meridians are mapped onto vertical lines and parallels of latitude onto horizontal lines. 

spheroidal

adj
  • Like a spheroid; roughly spherical. 

noun
  • A spheroid 

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