Question

What one word in Spanish can be mistaken in 3 ways as "the Pope", "Potato", or "Dad"

Answer 1

Papa (dad) papa (pope) papa (potato)

Answer 2

PAPA
 
Depending on how the word is used and context clues.
"Mira al Papa"   The Pope- Look at the Pope.
"Me como la papa."  Potato - I eat the potato.
"El es mi papa."  Dad- He is my dad.

Its confusing ,hoped I helped a bit.