Word

じじ、じじい、じい、ジジイ
old man; old geezer
Word

爺さん

祖父さん
じいさん
grandfather (may be used after name as honorific); male senior-citizen (may be used after name as honorific)
Word

親父

親爺、老爺、親仁
おやじ、ろうや、しんぷ
one's father; old man; one's boss
Word

狸爺

たぬきじじい
cunning old man
Word

お祖父さん

お爺さん、御爺さん、御祖父さん
おじいさん
grandfather; male senior-citizen
Word

好好爺

好々爺
こうこうや
good-natured old man
Word

エロ爺

エロじじい
dirty old man; pervert; groper (on trains); lecher
Word

糞爺

くそじじい
old man; old goat
Word

爺ちゃん

祖父ちゃん
じいちゃん
grandfather (may be used after name as honorific); male senior-citizen (may be used after name as honorific)
Word

爺むさい

爺穢い
じじむさい
like an old man; doddering; wizened; frowzy; seedy