het vs tropic

het

adj
  • Heated. 

  • heterozygous 

  • Heterosexual. 

noun
  • A heterosexual person. 

  • Fan fiction based on celebrities or fictional characters involved in an opposite-sex romantic and/or sexual relationship. 

  • heterozygote 

tropic

adj
  • Hot and humid. 

  • Of, or relating to the tropics; tropical. 

  • Having the quality of indirectly inducing a biological or chemical change in a system or substrate. 

  • Pertaining to, involving, or of the nature of a trope or tropes. 

noun
  • Either of the two parallels of latitude 23°27′ north and south of the equator; the farthest points at which the sun can be directly overhead; the boundaries of the torrid zone or tropics. 

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