RMS Mauretania (originally an ocean liner, launched in 1906, but during WWI it transported troops and used as a hospital ship. Retired in 1934, scrapped in 1935.)
USS West Mahomet (a steel-hulled cargo ship of the U.S. Navy, 1918-1919, but used as a merchant vessel under the name SS West Mahomet between 1919 and 1930….