Term for transposition of letters to form a new word?

There isn't a single, universally accepted term for the transposition of letters to form a new word. However, here are some terms you could use depending on the context:

General terms:

* Anagram: This is the most common and widely understood term. It refers to a word or phrase formed by rearranging the letters of another word or phrase.

* Letter permutation: This term is more technical and refers to the mathematical process of rearranging letters in a specific order.

* Wordplay: This is a broad term that encompasses various types of word manipulation, including anagrams.

More specific terms:

* Metagram: This term specifically refers to a word formed by changing one letter in another word.

* Spoonerism: This refers to a specific type of wordplay where the initial sounds of two words are accidentally swapped.

Other possibilities:

* Word puzzle: If the transposition of letters is part of a game or puzzle, you could simply call it a "word puzzle."

* Letter game: This is a broader term that encompasses any game or activity that involves rearranging letters.

The best term to use will depend on the specific context and your intended audience.