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

Note:
The expression is not equivalent in meaning to the phrase
serve two masters
— be loyal to two different people, completely
opposed principles, etc.: I felt I could not be effective, as a Coun-
cilor should there be the perception that I was serving two
masters.
have word • have words
have word —receive a message: After about four months, in
May, we had word that this comet was going to impact Jupiter.
have words —have a quarrel: Every time the two of them get
together they have words.
Note: 
The expression is not antonymous in meaning to the
phrase have no words— be unable to describe or talk about
smth.: We all here are quite astonished and have no words to
describe the situation.
head boy • principal boy
head boy —(UK) a school prefect who often represents the
school on public occasions: No matter how excellent may be
the original disposition of the head boy, if there is no one who
dare stick up to him, he soon becomes intolerable.
principal boy —traditionally in Great Britain an actress, not
an actor, who takes the leading male part in a pantomime:
You both walked as gracefully and proudly as if you were the
principal boy and girl at the Drury Lane pantomime.
head hunter • skull hunter
head hunter —
1
. a member of any tribe of savages who have
the custom of decapitating human beings: A chief named
Dungdong had become a notorious head-hunter. 2. (coll.) an
employment agent specializing in the recruitment of skilled
personnel: McCulloch had no compunction about using these
recruiting firms. They were, he knew, often derisively called
“head hunters.”
– 171 –
head hunter

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skull hunter — = head hunter 
1
: In spite of the depredations
of “skull hunters,” we rode a considerable distance over ground
… thickly strewn with human bones.