Question: affluence

Answer: a plentiful supply; wealth; a great quantity that seems to keep flowing

Question: confluence

Answer: a gathering, meeting, or flowing together at one point; a joining

Question: effluence

Answer: something that flows out; outflow

Question: fluctuate

Answer: to rise and fall irregularly; to vary; to flow up and down unpredictably

Question: fluent

Answer: able to flow smoothly; graceful