upwards

As a noun upside

is the highest or uppermost side or portion of something.

As a preposition upside

is (informal) on the top of.

As an adverb upwards is

towards a higher place; towards what is above.

As adverbs the difference between upwards and forward

is that upwards is towards a higher place; towards what is above while forward is towards the front or from the front.

As a noun forward is

(dialectal|or|obsolete) agreement; covenant or forward can be (rugby) one of the eight players (comprising two props, one hooker, two locks, two flankers and one number eight, collectively known as the pack) whose primary task is to gain and maintain possession of the ball (compare back).

As an adjective forward is

toward the front or at the front.

As a verb forward is

to advance, promote.

As adverbs the difference between upstairs and upwards

is that upstairs is up the stairs; on a higher floor or level while upwards is towards a higher place; towards what is above.

As an adjective upstairs

is located higher up a building.

As adverbs the difference between upwards and downward

is that upwards is towards a higher place; towards what is above while downward is toward a lower level, whether in physical space, in a hierarchy, or in amount or value.

As an adjective downward is

moving or sloping down.

As adverbs the difference between onwards and upwards

is that onwards is onward while upwards is towards a higher place; towards what is above.

As adverbs the difference between upwards and towards

is that upwards is towards a higher place; towards what is above while towards is (obsolete) in the direction of something (indicated by context).

As a preposition towards is

variant of toward.

As an adjective towards is

(obsolete) near; at hand; in state of preparation; toward.

As adverbs the difference between upwards and backwards

is that upwards is towards a higher place; towards what is above while backwards is toward the back.

As an adjective backwards is

oriented toward the back.

As adverbs the difference between upwards and upwardly

is that upwards is towards a higher place; towards what is above while upwardly is in an upward manner.

As an adverb upwards is

towards a higher place; towards what is above.