Some nouns have different meanings depending on whether they are singular or plural.
| Singular | Plural |
| Féria: sales money, merchant's salary | Férias: rest period |
| Bem: virtue | Bens: property |
| Copa: treetop, crown | Copas: spade (suit in cards) |
| Cobre: metal | Cobres: possessions |
| Costa: coast | Costas: back |
| Ferro: metal | Ferros: tools, appliances |
| Haver: credit | Haveres: assets |
| Humanidade: human race | Humanidades: classics (literature/studies) |
| Ouro: metal | Ouros: diamond (suit in cards) |
There are countless examples of exceptions. Reference: Faraco & Moura.



