Concept:
A one-word substitute is a single word used in place of a long phrase.
The phrase is:
\[
\text{A person who studies elections and voting statistics}
\]
Step 1: Understand the field.
The study of elections, voting behaviour, and election statistics is called
\[
\text{Psephology}
\]
Step 2: Identify the person.
A person who studies psephology is called a
\[
\text{Psephologist}
\]
Step 3: Check other options.
An election officer conducts or manages election work.
A philanthropist is a person who helps others by donating money or resources.
A voter is a person who votes in an election.
Step 4: Final answer.
\[
\boxed{\text{Psephologist}}
\]
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