lake vs bayou

lake and bayou both are nouns.

Word	Noun	Adjective	Verb	Adverb
lake	Yes	No	No	No
bayou	Yes	No	No	No

As nouns, bayou is a hyponym of lake; that is, bayou is a word with a more specific, narrower meaning than lake:

lake: a body of (usually fresh) water surrounded by land
bayou: a swampy arm or slow-moving outlet of a lake (term used mainly in Mississippi and Louisiana)

lake (noun)	bayou (noun)
a body of (usually fresh) water surrounded by land	a swampy arm or slow-moving outlet of a lake (term used mainly in Mississippi and Louisiana)
any of numerous bright translucent organic pigments
a purplish red pigment prepared from lac or cochineal