As a noun expansion

is expansion.

As an adjective expansile is

expansionary, relating to expansion.

As adjectives the difference between expandable and expansile

is that expandable is having the capacity to be expanded while expansile is expansionary, relating to expansion.

As a noun expandable

is anything that can be expanded.

As a verb counteract

is to act in opposition to; thwart; to hinder, defeat, or frustrate, by contrary agency or influence; as, to counteract the effect of medicines; to counteract good advice.

As an adjective antiriot is

serving to counteract rioting.

As a noun riot

is wanton or unrestrained behavior; uproar; tumult.

As a verb riot

is to create or take part in a riot; to raise an uproar or sedition.

As an adjective antiriot is

serving to counteract rioting.

As nouns the difference between slide and downslide

is that slide is an item of play equipment that children can climb up and then slide down again while downslide is a slide downward; a worsening.

As a verb slide

is (ergative) to (cause to) move in continuous contact with a surface.

As an adverb 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 a noun downslide is

a slide downward; a worsening.

As a verb worsen

is to make worse; to impair.

As a noun downslide is

a slide downward; a worsening.

Upswing is an antonym of downslide.

As nouns the difference between upswing and downslide

is that upswing is an upward swing while downslide is a slide downward; a worsening.

As a noun mold

is a hollow form or matrix for shaping a fluid or plastic substance or mold can be (senseid)a natural substance in the form of a woolly or furry growth of tiny fungi that appears when organic material lies for a long time exposed to (usually warm and moist) air or mold can be loose friable soil, rich in humus and fit for planting.

As a verb mold

is to shape in or on a mold or mold can be to cause to become moldy; to cause mold to grow upon or mold can be to cover with mold or soil.

As an adjective moldlike is

resembling mold (fungal growth) or some aspect of it.

Centreless is an alternative form of centerless.

As adjectives the difference between centreless and centerless

is that centreless is while centerless is without a center.