ala vs shoulder blade

ala

noun
  • A wing or winglike anatomic process or part, especially of bone. 

  • In ancient Rome, a small room opening into a larger room or courtyard. 

  • The flattened border of some stems, fruits, and seeds, or one of the two side petals of certain flowers in the pea family. 

shoulder blade

noun
  • Either of the large flat bones at the back of the shoulder. 

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