A nonsense word, unlike a sememe, may have no definition. Nonsense words can be classified depending on their orthographic and phonetic similarity with (meaningful) words. If it can be pronounced according to a language's phonotactics, it is a pseudoword. Nonsense words are used in literature for poetic or humorous effect. Proper names of real or fictional entities are sometimes nonsense words.
Nonsense words are also used by researchers and educators as a tool to assess a learner's phonetic decoding ability. The words follow phonetic rules but have no meaning. 
A stunt word is a nonsense word used for a special effect, or to attract attention, as part of a performance. Such words are a feature of the work of Dr. Seuss ("Sometimes I am quite certain there's a Jertain in the curtain").
- Raymond M. Klein; Patricia A. McMullen (1999). Converging Methods for Understanding Reading and Dyslexia. MIT Press. pp. 67–68. ISBN 978-0-262-11247-5.
- Natalie Wilson Rathvon (2004). Early Reading Assessment: A Practitioner's Handbook. Guilford Press. p. 138. ISBN 978-1-57230-984-5.
- "DIBELS Nonsense Word Fluency, University of Oregon".
- "STUNT WORD." Concise Oxford Companion to the English Language. . Encyclopedia.com. 3 Apr. 2019 <https://www.encyclopedia.com>.
- Muriel Deutsch Lezak (2004). Neuropsychological Assessment 4e. Oxford University Press. p. 596. ISBN 978-0-19-511121-7.
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