The Portuguese word for cabbage is
couve

Gender

The gender of couve is feminine. E.g. a couve.

The plural of couve is couves.

cabbage
1. repolho

vegetal
1. n-m. vegetable (edible material derived from a plant)
2. n-m. (figuratively) vegetable (person whose body or brain has been damaged so that they cannot interact with the surrounding environment)
3. adj. (relational) plant
célula vegetal - plant cell

repolho
1. n-m. round cabbage

couve
1. n-f. several leaf vegetables, from the family Brassica oleracea
2. n-f. kale (plant)
3. n-f. cabbage (plant)
4. n-f. collard greens (plant)
5. n-f. couves (small truck on horse or rope hauled railway)