The spelling of "nail colors mast" can be confusing due to the various sounds and combinations of letters. In IPA phonetic transcription, it is written as /neɪl ˈkʌlərz mæst/. The first syllable has the long "a" sound, represented by the symbol /eɪ/. The second syllable has a short "u" sound, represented by /ʌ/. The last two syllables both use the letter "a" to represent a short "a" sound, but the "s" and "t" at the end are silent. Overall, careful pronunciation is key to correctly spelling and saying this phrase.