firmness vs reliance

firmness

noun
  • strictness; mental strength 

  • security; steadfastness; good grip 

  • physical durability; rigidness (of material) 

reliance

noun
  • The condition of being reliant or dependent. 

  • A person or thing which relies on another. 

  • The act of relying (on or in someone or something); trust. 

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