signor vs. signer

signor

noun

plural signors, Italian signori
  1. a conventional Italian term of address or title of respect for a man, either used separately or prefixed to the name. : Sig., sig.

signer

noun

  1. a person who signs.
  2. a person who writes their name, as in token of agreement.
  3. a person who communicates by or interprets into sign language.