bombora vs boomer

bombora

noun
  • A shallow isolated piece of reef located a distance offshore. 

boomer

noun
  • Something that makes a booming sound. 

  • A bittern (subfamily Botaurinae). 

  • A transient worker who would move from boom town to boom town in search of temporary work. 

  • A mountain beaver (Aplodontia rufa). 

  • A red squirrel (Tamiasciurus hudsonicus). 

  • An elderly person, regardless of generation. 

  • A person who is too old to be familiar with the use of recent technology. 

  • A nuclear ballistic missile submarine, SSBN. 

  • An adult male kangaroo. 

  • A device used to bind or tighten chain. 

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