牛 /niú/ angolul

bovine▼(animal like cattle, buffalo, bison)
noun
[UK: ˈbəʊ.vaɪn] [US: ˈboʊ.vaɪn]

cattle [cattle]▼(domesticated bovine animals)
noun
[UK: ˈkæt.l̩] [US: ˈkæt.l̩]

cow [cows]▼(any domestic bovine regardless of sex or age)
noun
[UK: kaʊ] [US: ˈkaʊ]

ox [oxen]▼(any bovine animal used as a beast of burden)
noun
[UK: ɒks] [US: ˈɑːks]