As nouns the difference between grandson and nevvy
is that grandson is a son of one's child while nevvy is a nephew.
grandson
English
Noun
(
en noun)
A son of one's child.
Synonyms
* grandboy
Antonyms
* (with regard to gender) granddaughter
* (with regard to ancestry) grandmother, grandfather
Hypernyms
* grandchild
nevvy
English
Alternative forms
* (l), (l), (l), (l)
Noun
(head)
A nephew.
A grandson.