light brown vs brown

light brown and brown both are nouns.

Word	Noun	Adjective	Verb	Adverb
light brown	Yes	No	No	No
brown	Yes	Yes	Yes	No

As nouns, brown is a hypernym of light brown; that is, brown is a word with a broader meaning than light brown:

Other hypernyms of light brown include brownness.

light brown (noun)	brown (noun)
a brown that is light but unsaturated	an orange of low brightness and saturation

light brown (adjective)	brown (adjective)
	(of skin) deeply suntanned
	of a color similar to that of wood or earth

light brown (verb)	brown (verb)
	fry in a pan until it changes color
	make brown in color