Correct Answer: Anagram

Solution : The correct one-word substitute for the given group of words is the third option.

Explanation for each option:

1. "Anaphora" - Anaphora is a rhetorical device in which a word or phrase is repeated at the beginning of successive clauses or sentences.

2. "Amateur" - Amateur refers to a person who engages in an activity as a pastime rather than as a professional.

3. "Anagram" - An anagram is a word or phrase formed by rearranging the letters of a different word. This is the correct one-word substitute for the given group of words.

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4. "Accessible" - Accessible means easy to approach, reach, or obtain and is unrelated to the concept of rearranging words to form new ones.