infix vs ingrain

infix

verb
  • To instill. 

  • To insert a morpheme inside an existing word. 

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. 

ingrain

verb
  • To make (something) deeply part of something else. 

  • To dye with a fast or lasting colour. 

noun
  • An ingrain fabric, such as a carpet. 

adj
  • Dyed with grain, or kermes. 

  • Dyed before manufacture; said of the material of a textile fabric; hence, in general, thoroughly inwrought; forming an essential part of the substance. 

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