"allomorphs" in the noun sense
1. allomorph
any of several different crystalline forms of the same chemical compound
"calcium carbonate occurs in the allomorphs calcite and aragonite"
2. allomorph
a variant phonological representation of a morpheme
"the final sounds of `bets' and `beds' and `horses' and `oxen' are allomorphs of the English plural morpheme"
Source: WordNet® (An amazing lexical database of English)
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