nevertheless vs however

nevertheless and however both are adverbs.

Word	Noun	Adjective	Verb	Adverb
nevertheless	No	No	No	Yes
however	No	No	No	Yes

As adverbs, nevertheless and however are synonyms defined as:

nevertheless and however: despite anything to the contrary (usually preceding a concession)

Other synonyms of nevertheless include all the same, at the same time, even so, nonetheless, notwithstanding, still, withal, yet.

nevertheless (adverb)	however (adverb)
despite anything to the contrary (usually preceding a concession)	despite anything to the contrary (usually preceding a concession)
	in whatever way or manner
	to whatever degree or extent
	by contrast; on the other hand