Identify the common category: Items (1), (2), (4), and (5) are all names of national currencies.
Lek — currency of Albania.
Zloty — currency of Poland.
Drachma — historical currency of Greece (pre-euro).
Real — currency of Brazil.
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.
\[
\boxed{\text{Odd word: (3) Diner}}
\]