However, you could use some suffixes depending on what you want to express:
* -ly: While not a suffix directly for "fluency," you can use "-ly" to create an adverb, like "fluently." This describes something done with fluency.
* -ness: This suffix could be used to create a noun referring to the state or quality of fluency. For example, you could say "fluency-ness," although this sounds somewhat awkward.
* -ant: This suffix could be used to create a noun referring to a person who is fluent in something. For example, "fluency-ant" could be used to describe someone who is fluent in a language.
* -ism: This suffix could be used to create a noun referring to a method or system for achieving fluency. For example, "fluency-ism" could be used to describe a particular way of teaching language skills that emphasizes fluency.
Ultimately, the best suffix to use depends on the specific meaning you want to convey. If you can provide more context, I can help you find the most appropriate suffix.