oval vs spheroid

oval

adj
  • Having the shape of an oval. 

  • Of or pertaining to an ovum. 

noun
  • A thing having such a shape, such as an arena. 

  • In a projective plane, a set of points such that no three are collinear and there is a unique tangent line at each point. 

  • An elongated round shape resembling an egg or ellipse. 

  • A sports field, typically but not exclusively oval in shape. 

spheroid

adj
  • Of a shape similar to a squashed sphere. 

noun
  • A solid of revolution generated by rotating an ellipse about its major (prolate), or minor (oblate) axis. 

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