Watch for near-homophones or look-alike spellings in "odd one out" questions—Diner vs. Dinar changes the category completely.
Identify the common category: Items (1), (2), (4), and (5) are all names of national currencies.
Contrast with option (3): Diner (spelled with an e) is not a currency; it is an English word meaning a person who dines or a type of casual restaurant. (A currency spelled Dinar would fit the pattern, but that is not what is written.)
Therefore, the only item not belonging to the currency category is (3) Diner.
\[ \boxed{\text{Odd word: (3) Diner}} \]