burgeoning vs snowballing

burgeoning

noun
  • A new growth or expansion of something. 

  • A bud or branch. 

  • The act of budding or sprouting. 

adj
  • That buds, grows or expands; developing. 

snowballing

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