What's the difference between grandpa and uncle in Japanese?

Question

Answer

Ojisan also means random middle age men whose hygiene is terrible lol
So it could be a bit offensive. Be careful when you call someone "Ojisan" ;)

Answer

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Answer

This might help you to hear the difference;

uncle (ojisan): https://www.youtube.com/watch?v=HAJNrkZ1hKg

grandfather (ojiisan): https://www.youtube.com/watch?v=gy4EzrdojFY

Answer

Every time I hear ojisan and ojiisan it sounds the same to me for some reason and it confuses the heck out of me...

Answer

grandpa = おじいさん(ojiisan)　or そふ(sofu)
uncle = おじさん(ojisan)

Be sure to hold out the "jii" in grandpa fully, otherwise people will think you are saying uncle.