It can be, but it isn't always so. It can also be an adjective.
Adverb: It spiraled downward. The verb is modified by 'downward'.
Adjective: It moved in a downward spiral. The noun 'spiral' is being modified here.
"Downward" is an adjective used to describe the direction of movement, while "downwards" is an adverb that modifies a verb indicating a downward action. For example, "The elevator is moving downward" (adjective) versus "She looked downwards" (adverb).
Downwards
It flows downwards. It flows downwards.
Love Spirals Downwards ended in 1999.
Love Spirals Downwards was created in 1991.
Water flows downwards due to Earth's gravity.
upwards
Downwards.
Ever - Love Spirals Downwards album - was created in 1996.
Formations that grow downwards from the top of the cave are called stalactites.
The baby will experienced lightening or going downwards at 36 weeks about to engaged.
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