homo- vs ortho-

homo-

prefix
  • Used to form the names of compounds derived from simpler ones by addition of a methylene group. 

  • Same, identical. 

  • Of or pertaining to homosexuals or homosexuality. 

ortho-

prefix
  • in isomeric benzene derivatives, having the two substituents in adjacent (2,6) positions (compare meta- and para-). 

  • Straight, right, proper. 

  • Having an extra proportion of water. 

  • of any molecule of the form X₂ in which the two nuclei have parallel spin. 

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