The word "MARTU" is spelled with four letters, each with a distinct sound. The first sound is the "m" sound, pronounced as /m/. The second sound is the "a" sound, pronounced as /ɑ/. The third sound is the "r" sound, pronounced as /r/. And finally, the last sound is the "t" sound, pronounced as /t/. When combined, these sounds create the word "MARTU." It is important to note that the word has no meaning or context without further information.