gramps

/ɡræmps/
noun
  1. An informal term for grandfather.
    • Gramps takes me to the park every Saturday.
    • I asked Gramps to tell me a story about when he was young.
    • We're visiting Gramps for his birthday.
  2. A friendly or respectful way to address an older man.
    • The neighbor, known as Gramps, always waves hello.
    • Hey gramps, can you help me lift this box?
    • The kid smiled and said, 'Thanks, gramps!'