Merchantman
/ˈmɜːrtʃəntmən/
Definition 1 of 1
Pro Tip 1/3Historical Usage
Originally common in the age of sail and exploration. 
Models of old merchantmen are displayed in the maritime museum.
Pro Tip 2/3Trade Specific
Especially refers to ships carrying cargo for trade, not passengers. 
The Dutch merchantman was laden with spices and silk from the Orient.
Pro Tip 3/3Neutral Tone
The term is neutral, without positive or negative connotations. 
The insurance for a merchantman depends on its size and cargo.