Grandfather

Pro Tip 1/3

Grandfather refers specifically to a male relative; there's no female equivalent for this term.

Her grandfather, not grandmother, served in the war.

Pro Tip 2/3

Grandfather indicates a direct ancestor two generations above you, not just any older relative.

I learned gardening from my grandfather, my mom's dad.

Pro Tip 3/3

Often used endearingly for someone who may not be a relative but is old and cherished.

We all call him grandfather because he's so caring.