adverbial phrase vs clause

adverbial phrase

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

clause

noun
  • A verb, its necessary grammatical arguments, and any adjuncts affecting them. 

  • A verb along with its subject and their modifiers. If a clause provides a complete thought on its own, then it is an independent (superordinate) clause; otherwise, it is (subordinate) dependent. 

  • A separate part of a contract, a will or another legal document. 

verb
  • To amend (a bill of lading or similar document). 

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