Sound in not the only difference between british english and american english. The two languages have different words for some things. For example the words for clothing are different. Americans use the word "sweater" but the british say "jumper." Americans wear "vests" over their shirts but in England they wear "vests" under their shirts. An american man wears a "tuxedo" to a very fancy party but an englishman wears a "dinnerjacket." Americans talk about "pants" or "slacks" but the british talk about "trousers.