infix vs unlink

infix

noun
  • A morpheme that always appears between other morphemes in a word, such as -i- and -o- in English (i.e. an interfix). 

  • A morpheme inserted inside an existing word, such as -bloody- in English. 

verb
  • To insert a morpheme inside an existing word. 

  • To instill. 

unlink

noun
  • A link that is equivalent (under ambient isotopy) to finitely many disjoint circles in the plane. 

verb
  • To decouple; to remove a link from, or separate the links of. 

  • To delete (a file). 

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