4
progenitor(noun, paternity)
3
centenarian
3
gaffer
3
grandpapa
3
grandparent
3
old man(expression, idiom, veteran)
3
predecessor
2
oldster(noun, senior)
2
ascendent
2
golden-ager
2
grandpappy(noun, grandpa, grandsire, granddad)
2
graybeard
2
nonagenarian
2
octogenarian
2
paternal grandfather(expression, idiom)
2
sexagenarian
2
veteran
1
chief
1
grandmother
1
pantaloon
10 years ago|10k views|share |citing 
APASmart Define. (2016). grandfather thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/grandfather/thesaurus/synonyms
ChicagoSmart Define. 2016. "grandfather thesaurus" https://smartdefine.org/grandfather/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2016, grandfather thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/grandfather/thesaurus/synonyms>.
MLASmart Define. "grandfather thesaurus" 2 March 2016. Web. 29 September 2026. <https://smartdefine.org/grandfather/thesaurus/synonyms>