As nouns the difference between grandpa and grandparent
is that grandpa is (informal) grandfather while grandparent is the parent of someone's parent.
grandparent
Noun
(
en noun)
the parent of someone's parent
Hyponyms
* (by grandparent's gender ) grandmother, grandfather
* (by parent's gender ) maternal grandmother, maternal grandfather, paternal grandmother, paternal grandfather
Antonyms
* (with regard to ancestry ) grandchild
Derived terms
* great grandparent
* great great grandparent
See also
* mother
* father