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.
Water flows downwards due to Earth's gravity.
Love Spirals Downwards ended in 1999.
Love Spirals Downwards was created in 1991.
Lightning travels both upwards and downwards in the atmosphere.
1. Adverb Of Time2. Adverb Of Place3. Adverb Of Manner4. Adverb Of Degree of Quantity5. Adverb Of Frequency6. Interrogative Adverb7. Relative Adverb
"Ever" is an adverb.
Softly is an adverb.
Downwards.
upwards