Somewhere between the two was the position of minister plenipotentiary.
From the en.wikipedia.org
French consul M. Baudais was recalled and replaced with a new special minister plenipotentiary.
From the en.wikipedia.org
He was moved to London in 1800, at first as commissioner for the exchange of prisoners of war, then as minister plenipotentiary.
From the en.wikipedia.org
Promoted minister plenipotentiary, 1944, he became Canada's ambassador to the United States on 1 January 1945, until September 1946.
From the en.wikipedia.org
Asad also helped to set up the modern world's first Islamic state, Pakistan, which he represented as its minister plenipotentiary to the United Nations.
From the theatlantic.com
In 1919 the Dutch government appointed him envoy extraordinary and minister plenipotentiary to Romania, and later to Czechoslovakia, where he retired in 1932.
From the en.wikipedia.org
In August, 1848, Beaumont was elected plenipotentiary minister to London, and at the presidential elections of 10 December, they gave their support to Cavaignac.