The term 'apologetic word' can refer to two different words, both of which are commonly used to express regret or remorse. The first word is 'SORRY, ' which is a five-letter word that is often used to express sorrow or regret for something that has been done. The second word is 'OOPS, ' which is a four-letter word that is used to express surprise or dismay at an unexpected event or mistake. Both words are used to express regret or remorse and can be used in a variety of situations.