If you are looking for the meaning of accusative in latin my competance is not good enough, but if you are looking for just the word in latin it is accusativus
Elephant (accusative singular).
Boys (accusative case).
You must mean the word mater (there is no matr). The accusative singular of this is matrem; the accusative plural matres.
A letter/message (accusative singular).
Makes it accusative.
Ship (accusative).
The accusative word for Pictor in latin is Picturam.
A bull (accusative/direct object case).
It means 'mind' (accusative singular).
It is the Nominative, Vocative and Accusative Plural of 'Neck'
it means "with me" in the accusative (as in, sombody talking to sombody else) it means "with me" in the accusative (as in, sombody talking to sombody else)
Bonam is the feminine accusative singular of the Latin adjective Bonus, which means "good."