Morphophonology (also morphophonemics, morphonology)'s a branch of linguistics which studies: The phonological structure of morphemes. The combinatory phonic modifications of morphemes which happen when they're combined The alternative series which serve a morphological function. Examples of a morphophonological alternatives in English include these distinctions: Plurals "-es" and "-s", as in "bus, buses", vs. "bun, buns". Plural of "-f"'s "-ves", as in "leaf, leaves" Different pronunciat… (More on Morphophonology)