However, there are several ways to form words related to "rapid" using suffixes:
* -ly: This suffix creates adverbs, indicating manner. Rapidly is the most common example.
* -ity: This suffix forms nouns, indicating a state or quality. Rapidity refers to the quality of being rapid.
* -ness: This suffix forms nouns, also indicating a state or quality. Rapidness is another way to refer to the quality of being rapid.
While "rapid" itself doesn't have a specific suffix, these suffixes allow you to build related words depending on the intended meaning.