inarticulation vs locution

inarticulation

noun
  • The state of being inarticulate; inarticulateness. 

  • An inarticulate or underarticulated utterance. 

  • Any point in the educational system in which the development of the individual is hindered. 

locution

noun
  • A phrase or expression connected to an individual or a group of individuals through repeated usage. 

  • A supernatural revelation where a religious figure, statue or icon speaks, usually to a saint. 

  • The use of a word or phrase in an unusual or specialized way. 

  • Style of discourse or usage, or any particular utterance in such style. 

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