A dictionary of Confusable Phrases: More Than 10,000 Idioms and Collocations

Lord Admiral • Lord of the Admiralty
Lord Admiral —(hist.) head of the naval administration of
Great Britain: As she is escorted out of the courtroom, she
overhears the Lord Admiral Cotwell talking with his long time
friends.
Lord of the Admiralty —(UK) one of the five lords commis-
sioners of the Admiralty: Lord Camelford can boast of a power
which rivals that of the First Lord of the Admiralty.
Lord Chamberlain • Lord Great Chamberlain
Lord Chamberlain —(UK) an officer responsible for the royal
household who is also the licenser of plays (also: Lord Cham-
berlain of the Household): But the particular function of the
Lord Chamberlain led to many clashes over works that have
since become classics.
Lord Great Chamberlain —(UK) a hereditary officer of state
whose duties were originally financial but are now mainly cer-
emonial: Control of the Palace of Westminster was for cen-
turies exercised by the Queen’s representative, the Lord Great
Chamberlain.
Lord Commissioner • Lord High Commissioner
Lord Commissioner —a member of a board exercising the
powers of a high British office of state: The Reading Clerk
bows to each Lord Commissioner as he is named, and the
Commissioner responds by raising his hat.
Lord High Commissioner —the representative of the British
Crown at the annual General Assembly of the Church of Scot-
land: The present building is still used as a residence by the
reigning Monarch and by the Lord High Commissioner during
the Assembly of the Church of Scotland.
Note: 
The expression is not equivalent in meaning to the phrase
High Commissioner
— the head of the British diplomatic mission
in a Commonwealth country: A High Commissioner from the
United Kingdom would be appointed to take over from the
Viceroy duties connected with the representation of Britain
in India.