What is it called when you add a syllable to word?

There isn't a single specific term for adding a syllable to a word. However, depending on the context, you could use one of these terms:

* Suffixation: This is the process of adding a suffix to a word, which often adds a syllable.

* Affixation: This is the broader term for adding any prefix or suffix to a word, which can also change the number of syllables.

* Syllabification: This refers to the process of dividing a word into its syllables, which can help you understand how adding a syllable changes the pronunciation.

* Morphological change: This is the broader term for any change to the form of a word, including adding syllables through prefixes, suffixes, or inflections.

Ultimately, the best term to use depends on the specific situation and what you want to emphasize.