gibbous vs prominent

gibbous

adj
  • Characterized by convexity; protuberant. 

  • Humpbacked. 

  • Having more than half (but not the whole) of its disc illuminated. 

prominent

adj
  • standing out, or projecting; jutting; protuberant 

  • likely to attract attention from its size or position; conspicuous 

  • eminent; distinguished above others 

noun
  • Any of various moths having a conspicuous projection on the inner margin of the wings. 

  • In Nazi concentration camps, an inmate entrusted with minor supervisory duties and rewarded with perquisites. 

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