The correct spelling of the word "Main-hamper," which refers to the largest or primary support of a ship's mast, can be explained using the International Phonetic Alphabet (IPA). The first syllable of the word is pronounced as "meyn," using the long "a" sound. The second syllable is pronounced "ham-per," with the "a" sound as in "cat." Overall, the word is spelled as "meyn-ham-per" and is pronounced as /meɪnˈhæmpər/ in IPA. Proper spelling ensures clear communication and avoids confusion in writing and conversation.