fraternal vs brotherly

fraternal and brotherly both are adjectives.

Word	Noun	Adjective	Verb	Adverb
fraternal	No	Yes	No	No
brotherly	No	Yes	No	Yes

As adjectives, fraternal and brotherly are synonyms defined as:

fraternal and brotherly: like or characteristic of or befitting a brother

Other synonyms of fraternal include brotherlike.

fraternal (adjective)	brotherly (adjective)
(of twins) derived from two separate fertilized ova	like or characteristic of or befitting a brother
like or characteristic of or befitting a brother
of or relating to a fraternity or society of usually men

fraternal (adverb)	brotherly (adverb)
	(archaic as adverb) in a manner characteristic of a brother