continuous tense vs progressive tense

continuous tense

noun
  • A verb tense expressing ongoing action; in English, any of the tenses formed with the present participle, namely present continuous ("I am dreaming"), past continuous ("I was dreaming"), present perfect continuous ("I have been dreaming"), past perfect continuous ("I had been dreaming"), future continuous ("I will be dreaming") or future perfect continuous ("I will have been dreaming"). 

progressive tense

noun
  • Synonym of continuous tense. 

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