10
grandfather(noun, veteran, paternity)
7
father(noun, paternity)
6
sire(noun, paternity)
5
dotard
5
forefather(noun, grandpa, granddad)
5
parent(noun, paternity)
4
ancestor(noun, paternity, grandpa, granddad)
4
predecessor
4
root
3
centenarian
3
forebear
3
foregoer
3
gaffer
3
grandpa(noun, granddad)
3
old man(expression, idiom, veteran)
3
patriarch(noun, veteran, grandpa, granddad)
3
primogenitor
2
elder(noun, grandpa, granddad)
2
gramps(noun, ancestor, grandpa, grandfather, granddad)
2
granddad
10 years ago|2.3k views|share |citing 
APASmart Define. (2016). grandsire thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/grandsire/thesaurus/synonyms
ChicagoSmart Define. 2016. "grandsire thesaurus" https://smartdefine.org/grandsire/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2016, grandsire thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/grandsire/thesaurus/synonyms>.
MLASmart Define. "grandsire thesaurus" 2 March 2016. Web. 20 September 2026. <https://smartdefine.org/grandsire/thesaurus/synonyms>