The spelling of the word "turn steam" can be explained using the International Phonetic Alphabet (IPA). The first sound is "t" which is pronounced as /t/. The second sound is "ur" which is pronounced as /ɜː/. The third sound is "n" which is pronounced as /n/. The fourth sound is "s" which is pronounced as /s/. The fifth sound is "t" which is pronounced as /t/. The sixth sound is "i" which is pronounced as /iː/. The seventh sound is "m" which is pronounced as /m/. When these sounds are combined, they make the word "turn steam" pronounced as /tɜːnstiːm/.