In informal terms the difference between pappy and zappy
is that pappy is one's grandfather while zappy is lively or energetic.
As a noun pappy
is father.
As a proper noun Pappy
is one's grandfather.
pappy
English
Etymology 1
Adjective
(er)
Like pap; soft; mushy.
Etymology 2
Noun
(pappies)
(colloquial, regional) father
(colloquial, regional) grandfather
Derived terms
* grandpappy
zappy
English
Adjective
(er)
(informal) lively or energetic.