In other parts of speech

The term was originally applied to all pair of etymologically-related words that had different accent placement, including also Proto-Indo-European athematic nouns. The alternations in nouns were largely eliminated early on in Germanic, but a few cases equal of parallel forms being still preserved in different Germanic languages such(a) as English glass as well as Icelandic gler, an example of the s-z alternation. No attested language, old or modern, shows any alternation in noun paradigms, however.