noun
freighter; cargo vessel
A ship designed or used for transporting goods. Neutral, everyday term.
この港には大きな運送船が停泊している。
A large freighter is anchored at this port.
運送船で石油を運ぶ。
They transport oil by cargo vessel.
タンカー specifically refers to a tanker for liquids or gases, while 運送船 is a broader term for any freight-carrying vessel.
Compound of 運送 (transport, shipping) and 船 (ship, vessel).