Select the most appropriate one-word substitution for the given group of words. 

One who compiles a dictionary.

Lexicographer

The most appropriate one-word substitution for one who compiles a dictionary is lexicographer.

• Calligrapher is a person who writes in a beautiful or elegant hand.
• Cryptography is the study of techniques for secure communication in the presence of third parties.
• Hypocrite is a person who pretends to have beliefs or feelings that they do not actually hold.

The word lexicographer is derived from the Greek words lexikós, meaning "of words", and gráphein, meaning "to write". It is a person who studies words and their meanings, and who compiles dictionaries. Lexicographers need to have a deep understanding of language, as well as the ability to research and write clearly and concisely.