su·per·car·go 
(s′pər-kärgō)
(s′pər-kärgō)n. pl. su·per·car·goes or su·per·car·gos
An officer on a merchant ship who has charge of the cargo and its sale and purchase.
[Alteration (influenced by SUPER-) of supracargo, alteration (influenced by SUPRA-) of Spanish sobrecargo : sobre-, over (from Latin super-; see SUPER-) + cargo, cargo; see CARGO.]