The best replacement for grandpa is grampa.

The best alternatives to grandpa are rated as following:
★★★★★  grampa
★★★★★  grandpa
★★★  grandfather
★★★  papa
★★★  grandma
★★  grandad
★★  papaw
★  pawpaw
★  last vegas
★  grandson
★  regular show
  paw paw
  steven universe
  tourettes guy

Your alternative for grandpa is not listed? Suggest!
Speaking about grandpa, one probably shouldn't forget about granddaughter.

Other search terms related to grandpa and their ratings are:
★★★★★ granddaughter
You have in mind a companion for grandpa and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of grandpa in all years. Click on graph for more.
grandpa
grampa
grandpa