predominant vs redbird

predominant

noun
  • A subdominant. 

adj
  • Common or widespread; prevalent. 

  • Significant or important; dominant. 

redbird

noun
  • A capsule of secobarbital. 

  • Any of various red cars formerly used in the New York City subway system; or a train of such cars. 

  • Any of several unrelated American songbirds having red plumage, especially the tanager or cardinal. 

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