From Latin "fluere" (to flow):
* Fluctuate: To change or vary irregularly.
* Fluid: Able to flow easily; liquid or gas.
* Fluidity: The quality of being fluid.
* Fluent: Able to speak or write easily and smoothly.
* Fluency: The quality of being fluent.
* Influx: A flow of something into a place.
* Effluent: Liquid waste that is discharged into the environment.
* Confluence: A place where two or more rivers meet.
* Superfluous: More than is needed or wanted.
* Influential: Having a strong influence on someone or something.
* Affluent: Having a lot of money or wealth.
* Defluent: Flowing downward.
From "influenza" (the flu):
* Influenza: A viral infection that causes fever, chills, muscle aches, and other symptoms.
Let me know if you'd like more examples or have any other questions.