The inverse of homonymy is homosemy, defined as different phonological structures related only by virtue of their symbolic correspondence to the same semantic unit. It is common argued that there are no true synonyms, that some semantic difference, however slight, can always be found to distinguish apparent homosemes. . . . a possible example of homosemes is afforded by phonologically dissimilar allomorphs of grammatical morphemes, e.g., the plural morpheme of English.