oval vs superficial

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. 

superficial

adj
  • Two-dimensional; drawn on a flat surface. 

  • Not thorough, deep, or complete; concerned only with the obvious or apparent. 

  • Lacking depth of character or understanding; lacking substance or significance. 

  • Existing, occurring, or located on the surface. 

  • Appearing to be true or real only until examined more closely. 

  • Situated or occurring on the skin or immediately beneath it. 

  • Denoting a quantity of a material expressed in terms of area covered rather than linear dimension or volume. 

noun
  • A surface detail. 

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