The spelling of the word "MEGACU" can be explained using the International Phonetic Alphabet (IPA). The first sound, /m/ is a bilabial nasal consonant, followed by a long /e/ sound as in "meat". The third sound, /g/, is a voiced velar stop consonant, while the fourth sound, /ə/, is a schwa vowel sound, commonly heard in the word "the". Finally, the word ends with a /k/ sound, another voiceless velar stop consonant. Together, these individual sounds create the word "MEGACU".