Suffixing is the process of adding a group of letters or a word to the end of another word to form a new word. There are several synonyms for the word suffixing, including affixing, adding on, appending, post-fixing, and tagging on. These words all refer to the action of adding something to the end of another thing. Suffixing is a common practice in the English language and is used to create new words or to change the meaning of existing words. It is important to use suffixes correctly to convey the intended meaning and to avoid confusion.