This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A body of water, such as a creek or small river, that is a tributary of a larger body of water.

n. A sluggish stream that meanders through lowlands, marshes, or plantation grounds.

n. A slow-moving, often stagnant creek or river.

n. A swamp, a marshy (stagnant) body of water.

n. An inlet from the Gulf of Mexico, from a lake, or from a large river, sometimes sluggish, sometimes without perceptible movement except from tide and wind.

n. In the southern United States, the outlet of a lake, or one of the several outlets of a river through its delta; a sluggish watercourse.

n. An abandoned portion of a river-channel forming a lake or swamp following the general course of the main stream: a special case of “ox-bow lake.” The bayous of the lower Mississippi river are typical.

n. a swampy arm or slow-moving outlet of a lake (term used mainly in Mississippi and Louisiana)

"The bayou is a French word meaning slow-moving waterway."

lake   

inlet   

estuary    firth    lacustrine    waterway    lagoon    sinkhole    modest-sized    rivulet    streamlet    creek