Post fixes refer to words or phrases that are added to the end of a base word to change its meaning. Synonyms for post fixes include suffixes, affixes, endings, terminations, and additions. All of these terms refer to the same concept of modifying the meaning of a word through the addition of letters or words to its end. Examples of post fixes include -er (as in writer), -ness (as in kindness), and -able (as in lovable). Understanding post fixes is important for improving language skills and developing a broader vocabulary. By recognizing common post fixes and their meanings, it becomes easier to decipher the meanings of unfamiliar words.