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

An act of rearranging letters of one word to make another word, phrase, or name 

Anagram

The most appropriate one-word substitution for "an act of rearranging letters of one word to make another word, phrase, or name" is anagram.

• Pantheism is a belief that God is the universe.
• Equilibrium is a state of balance or stability.
• Diatribe is a long, angry speech or piece of writing.
• Anagram is a word or phrase formed by rearranging the letters of another word or phrase.