ambiguity vs firmness

ambiguity

noun
  • words or statements that are open to more than one interpretation, explanation or meaning, especially if that meaning cannot be determined from its context. 

  • The state of being ambiguous. 

firmness

noun
  • security; steadfastness; good grip 

  • strictness; mental strength 

  • physical durability; rigidness (of material) 

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