You searched for: “allomorphs
allomorph (s) (noun), allomorphs (pl)
1. Any of two or more different forms of the same chemical compound: One of various crystalline forms of a substance is termed an allomorph
2. In linguistics, one of the alternate contextually determined phonological shapes of a morpheme: An example can be "en" in "oxen", which is an allomorph of the English plural morpheme.