👉 An antigrammatical word is a word that can be made by rearranging letters in another word to form another new word. For example, "antiquary" can be considered an antigrammatical word because it is formed by rearranging the letters in "antiquity."
https://goldloadingpage.com/word-dictionary/antigrammatically
https://goldloadingpage.com/word-dictionary/antigrammaticalness