endangered vs sheltered

endangered

adj
  • in danger, at risk, said of something where there is a strong possibility something bad will happen to it (for example, a species in danger of going extinct) 

sheltered

adj
  • Protected, as from wind or weather. 

  • (Of a person) who grew up being overprotected by parents or other guardians; often implies a lack of social skills or worldly experience 

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