brown-haired vs dark-haired

brown-haired and dark-haired both are adjectives.

Word	Noun	Adjective	Verb	Adverb
brown-haired	No	Yes	No	No
dark-haired	No	Yes	No	No

As adjectives, brown-haired and dark-haired are synonyms defined as:

Other synonyms of brown-haired include black-haired.

brown-haired (adjective)	dark-haired (adjective)
having hair of a dark color	having hair of a dark color
	covered with dark hair