"Post fix" is a technical term used to describe the sequence of characters that come after the main part of a word. There are several synonyms that refer to this concept, such as suffix, ending, tail, and postfix. A suffix is a morpheme added to the end of a word to create a different form or meaning. An ending refers to the final part of a word, often indicating its grammatical function. A tail is a part of a word that follows the root or stem, and postfix is a more specific term used in computer programming to indicate a sequence of characters attached to the end of a file or message. All of these terms are used to describe the part of a word that comes after the main component, providing additional meaning or context.