| Part of speech | unknown part of speech |
|---|
| Singular | Plural | |
|---|---|---|
| Nominative | bakteriofago | bakteriofagoj |
| Accusative | bakteriofagon | bakteriofagojn |
| Dutch | bacteriofaag |
|---|---|
| English | bacteriophage |
| French | bactériophage |
| German | Bakterienfresser; Bakteriophage |
| Portuguese | bacteriófago |
| Spanish | bacteriófago |