middlebrow vs second-rater

middlebrow

noun

  • A person or thing that is neither highbrow nor lowbrow, but in between. 

adj

  • Neither highbrow or lowbrow, but somewhere in between. 

second-rater

noun

  • A person or thing that is second-rate. 

How often have the words middlebrow and second-rater occurred in a corpus of books? (source: Google Ngram Viewer )