The word "retardments" is not a correct spelling. The correct spelling should be "retardants," which is pronounced as /rɪˈtɑrdnt̬s/. The use of the letter 'm' in the incorrect spelling is wrong because it does not correspond with the phonetic sound that follows the letter 't.' The correct spelling of a word is essential for clear communication, and it is recommended to double-check the spelling of unfamiliar words to avoid any misunderstandings or confusion.