These are not allomorphs; these are the minor exceptions where one grapheme can refer to two different morphemes. — in each of those examples, the meaning chang

These are not allomorphs; these are the minor exceptions where one grapheme can refer to two different morphemes. — in each of those examples, the meaning changes with a different pronunciation. Allomorphs do not change meaning, and typically occur in complementary distribution. A good example would be the English words “a” and “an” being allomorphs, “a” can only occur where “an” can not, and vice versā, and both have the exact same meaning and function.