THE THIRD DECLENSION

Words of the third declension are ending in -a. They are of feminine and masculine gender.

Feminine gender

sg.

1. žena
2. žen-e
3. žen-i
4. žen-u
5. žen-o
6. žen-om
7. žen-i

pl.

1. žen-e
2. žen-a
3. žen-ama
4. žen-e
5. žen-e
6. žen-ama
7. žen-ama

Masculine gender

sg.

1. sudija
2. sudij-e
3. sudij-i
4. sudij-u
5. sudij-o/sudij-a
6. sudij-om
7. sudij-i

pl.

1. sudij-e
2. sudij-a
3. sudij-ama
4. sudij-e
5. sudij-e
6. sudij-ama
7. sudij-ama

As you see, the suffixes are same for both feminine and masculine gender.

Polysyllabic words of feminine gender ending in -ica have suffix -e instead of -o in vocative form.