Select the option that can be used as a one-word substitute for the given group of words.

One who is well versed in many languages

Polyglot

A "polyglot" is a person who is well versed in or speaks many languages. They have the ability to understand, speak, read, and write multiple languages fluently. In the given group of words, "one who is well versed in many languages," the word "polyglot" accurately captures the concept of a person with extensive language proficiency.

"Verbose" refers to someone who uses more words than necessary or tends to be excessively wordy in their speech or writing. It does not specifically relate to language proficiency or being well versed in many languages.

"Linguist" refers to a person who studies languages or has a deep knowledge of language structure, history, or typology. While a linguist may have expertise in multiple languages, the term itself does not explicitly indicate proficiency in many languages.

"Stalwart" refers to a person who is loyal, reliable, and steadfast. It does not specifically refer to someone who is well versed in many languages.

Therefore, "Polyglot" is the most appropriate one-word substitute for the given group of words as it directly represents a person who is well versed in many languages and has the ability to communicate in multiple languages fluently.