The correct spelling of the word "most gesture" is "mOSTure" (/ˈməʊstjər/). The sound "o" is represented by the letter "O", while the sound "u" is represented by the letters "ST". The letter "E" at the end of the word is silent and serves only to indicate the pronunciation of the preceding letter "R". Phonetically, "mOSTure" includes a stressed first syllable with the second syllable pronounced as a schwa sound. Overall, the spelling of "mOSTure" reflects the way that it sounds when spoken aloud.