Nonaffix

Where no ambiguity has resulted, the terms (i.e., "verb," "nonverb," "noun," "adjective," etc.) applied to these classes have been used to refer to forms consisting of anything from a stem (single, nonaffix morpheme) to a sequence of several morphemes, whether or not the form in question constituted a word.

Source: wiktionary

In the extension of the affix Y to nonaffixes, the invented spelling is clearly more “phonetic” than standard spelling; it does not maintain the morphophonemic distinctions that are important in adult spelling.

Source: wiktionary