colligation vs idiom

colligation

noun
  • The co-occurrence of syntactic categories, usually within a sentence. 

  • A binding together. 

  • The formulation of a general hypothesis which seeks to connect two or more facts. 

idiom

noun
  • An established phrasal expression whose meaning may not be deducible from the literal meanings of its component words. 

  • An artistic style (for example, in art, architecture, or music); an instance of such a style. 

  • A manner of speaking, a mode of expression peculiar to a language, language family, or group of people. 

  • A programming construct or phraseology that is characteristic of the language. 

  • A language or language variety; specifically, a restricted dialect used in a given historical period, context etc. 

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