downwards vs downwardly

downwards and downwardly both are adverbs.

Word	Noun	Adjective	Verb	Adverb
downwards	No	No	No	Yes
downwardly	No	No	No	Yes

As adverbs, downwards and downwardly are synonyms defined as:

downwards and downwardly: spatially or metaphorically from a higher to a lower level or position

Other synonyms of downwards include down, downward.

downwards (adverb)	downwardly (adverb)
spatially or metaphorically from a higher to a lower level or position	spatially or metaphorically from a higher to a lower level or position