I guess the answer is the First Sea Lord
No. The equivalent rank in the Navy is Admiral.
The Royal Air Force rank of Air Marshal is equivalent to Vice-Admiral (Royal Navy) and Lieutenant-General (British Army and Royal Marines).
A Royal Navy Captain is the same as a United States Navy Captain - it's the equivalent of a full Colonel in the armies of both countries. The next rank up is Commodore - Brigadier equivalent.
In the US and British armed forces, a Naval Commander is equivalent in rank to an Army Lt. Colonel and a Naval Captain is equivalent in rank to an Army Colonel. Please see the related links.
His current Rank is Admiral of the Fleet
Lieutenant
Captain
Yes, the Navy has a rank of Sergeant. However, it is important to note that the rank structure and designations can vary among different countries' navies. In the United States Navy, the equivalent rank to a Sergeant is a Petty Officer Second Class.
I think it is The First Lord Seaman.
Star
No, there is no rank of commander in the Army. In the Army commander is a title, not a rank. In the Navy, there is a rank of Commander, it is the equivalent of Lt Colonel or O-5.