motto vs proverb

motto

noun
  • A sentence, phrase, or word, prefixed to an essay, discourse, chapter, canto, or the like, suggestive of its subject matter; a short, suggestive expression of a guiding principle; a maxim. 

  • A sentence, phrase, or word, forming part of an heraldic achievement. 

proverb

noun
  • A striking or paradoxical assertion; an obscure saying; an enigma; a parable. 

  • A drama exemplifying a proverb. 

  • A phrase expressing a basic truth which may be applied to common situations. 

  • A familiar illustration; a subject of contemptuous reference. 

verb
  • To name in, or as, a proverb. 

  • To write or utter proverbs. 

  • To provide with a proverb. 

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