adverbial phrase vs idiomatic

adverbial phrase

noun
  • A phrase that collectively modifies a verb, adjective, another adverb, or a prepositional phrase. 

idiomatic

noun
  • Synonym of idiom 

adj
  • Pertaining or conforming to idiom, the natural mode of expression of a language. 

  • Resembling or characteristic of an idiom. 

  • Relating to parts or pieces which are written both within the natural physical limitations of the instrument and human body and, less so or less often, the styles of playing used on specific instruments. 

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