besides vs likewise

besides and likewise both are adverbs.

Word	Noun	Adjective	Verb	Adverb
besides	No	No	No	Yes
likewise	No	No	No	Yes

As adverbs, besides and likewise are synonyms defined as:

Other synonyms of besides include also, as well, too.

besides (adverb)	likewise (adverb)
making an additional point; anyway	in like or similar manner
in addition	in addition
	equally