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guarantee, guaranty, warranty

Guarantee is both a verb and a noun. Guaranty is a spelling variant for the noun, used in certain legal contexts.

  • I can guarantee that Vicky will be back here within the week.
  • What guarantee (or guaranty) can you offer to the other parties?

A warranty is usually a guarantee offered on goods.

  • The bread machine broke down one week after the one-year warranty expired.