Hummus and hommus are used interchangeably. There's no difference in terms of the recipe, but there is a slight difference in the pronunciation of the word. Hummus sounds like hum-muhs whereas hommus is pronounced hoo-muhs. Americans typically say hummus, whereas the British will often use hommus. Not to confuse matters more, but there are other alternatives, such as hoummos, hoummus, and hommos.