motto vs. slogan

motto

noun

plural mottoes, mottos.
  1. a maxim adopted as an expression of the guiding principle of a person, organization, city, etc.
  2. a sentence, phrase, or word expressing the spirit or purpose of a person, organization, city, etc., and often inscribed on a badge, banner, etc.

slogan

noun

  1. a distinctive cry, phrase, or motto of any party, group, manufacturer, or person; catchword or catch phrase.
  2. a war cry or gathering cry, as formerly used among the Scottish clans.