dunkable vs rainproof

dunkable

adj

  • Waterproof. 

  • Suitable for dunking (as of food). 

noun

  • Any food item suitable for dunking. 

rainproof

adj

  • waterproof (for use outdoors); resistant to rain 

verb

  • To make rainproof. 

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