As nouns the difference between pound and slinch

is that pound is short for pound-force, a unit of force/weight or pound can be a place for the detention of stray or wandering animals or pound can be a hard blow while slinch is (physics|informal) an english unit of mass equal to 12 slugs (386088 pounds-mass), that accelerates by 1 inch per second squared (1 in/s²) when a force of one pound-force (lbf) is exerted on it.

As a verb pound

is to confine in, or as in, a pound; to impound or pound can be (label) to strike hard, usually repeatedly.

As a noun cost

is manner; way; means; available course; contrivance or cost can be amount of money, time, etc that is required or used or cost can be (obsolete) a rib; a side.

As a verb cost

is to incur a charge; to require payment of a price.

As an adverb costlessly is

without cost.

Costlessly is a derived term of costless.

Costlessly is a related term of costless.

As an adjective costless

is having no cost.

As an adverb costlessly is

without cost.

Costly is an antonym of costless.

As adjectives the difference between costly and costless

is that costly is of high cost; expensive while costless is having no cost.

As a noun altitude

is the absolute height of a location, usually measured from sea level.

As an adjective altitudinal is

of or in relation to altitude.

Altitudinally is a derived term of altitudinal.

As an adjective altitudinal is

of or in relation to altitude.

In historical terms the difference between caspiane and caspian

is that caspiane is the land at the southwestern shore of the Caspian Sea populated by the ancient tribe of Caspians while caspian is member of the ancient people dwelling along the southern and southwestern shores of the Caspian Sea, in the region which was called Caspiane after them.

As an adjective Caspian is

of or pertaining to Caspian Sea or the region around it.

As a noun geocorona

is the region of ionized hydrogen that makes up the outermost region of the earth's atmosphere (and by extension of other planets).

As an adjective geocoronal is

of or pertaining to the geocorona.

As a verb ionized

is (ionize).

As a noun geocorona is

the region of ionized hydrogen that makes up the outermost region of the earth's atmosphere (and by extension of other planets).

As nouns the difference between hydrogen and geocorona

is that hydrogen is the lightest chemical element (symbol h) with an atomic number of 1 and atomic weight of 100794 while geocorona is the region of ionized hydrogen that makes up the outermost region of the earth's atmosphere (and by extension of other planets).