Compare each case across both numbers. The forms below are the noun's stored reference paradigm.
Singular and plural case forms for остров
Case
Singular
Plural
Nominative
остров
острова
Accusative
остров
острова
Genitive
острова
островов
Dative
острову
островам
Instrumental
островом
островами
Prepositional
острове
островах
Form pattern
How the forms are built
The paradigm above is authoritative. These notes expose a transparent ending change only when the stored declension family supports one.
Genitive · Singularостров- + -а → острова
Keep the stored stem and add -а.
Show all case-build notes
Nominative · Singularостров
This is the dictionary form used to identify the noun.Nominative · Pluralостров- + -а → острова
Keep the stored stem and add -а.Accusative · Singularостров- + zero ending → остров
Remove the zero ending; this form has a zero ending.Accusative · Pluralостров- + -а → острова
Keep the stored stem and add -а.Genitive · Singularостров- + -а → острова
Keep the stored stem and add -а.Genitive · Pluralостров- + -ов → островов
Keep the stored stem and add -ов.Dative · Singularостров- + -у → острову
Keep the stored stem and add -у.Dative · Pluralостров- + -ам → островам
Keep the stored stem and add -ам.Instrumental · Singularостров- + -ом → островом
Keep the stored stem and add -ом.Instrumental · Pluralостров- + -ами → островами
Keep the stored stem and add -ами.Prepositional · Singularостров- + -е → острове
Keep the stored stem and add -е.Prepositional · Pluralостров- + -ах → островах
Keep the stored stem and add -ах.