downwardly vs downwards

downwardly and downwards both are adverbs.

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

As adverbs, downwardly and downwards are synonyms defined as:

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

Other synonyms of downwardly include down, downward.

downwardly (adverb)	downwards (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