GRANDFATHER Synonyms: 37 Similar and Opposite Words - Merriam-Webster
https://www.merriam-webster.com/thesaurus/grandfather
WebSynonyms for GRANDFATHER: father, ancestor, grandmother, forefather, progenitor, forebear, forbear, primogenitor; Antonyms of GRANDFATHER: descendant, family, children, son, daughter, descendent, offspring, issue.
DA: 43 PA: 87 MOZ Rank: 88