likewise vs besides

likewise and besides both are adverbs.

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

As adverbs, likewise and besides are synonyms defined as:

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

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