circumlocution vs periphrase

circumlocution

noun
  • Unnecessary use of extra words to express an idea, such as a pleonastic phrase (sometimes driven by an attempt at emphatic clarity) or a wordy substitution (the latter driven by euphemistic intent, pedagogic intent, or sometimes loquaciousness alone). 

  • Necessary use of a phrase to circumvent either a vocabulary fault (of speaker or listener) or a lexical gap, either monolingually or in translation. 

  • An instance of such usage; a roundabout expression, whether an inadvisable one or a necessary one. 

periphrase

noun
  • The use of more words than are necessary to express the idea; a roundabout, or indirect, way of speaking; circumlocution. 

verb
  • To use circumlocution. 

  • To express by periphrase or circumlocution. 

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