As a verb preventing

is present participle of lang=en.

As an adjective antiadrenergic is

preventing or counteracting the effects of adrenaline.

As a verb counteracting

is .

As an adjective antiadrenergic is

preventing or counteracting the effects of adrenaline.

As a noun effect

is the result or outcome of a cause see below .

As a verb effect

is to make or bring about; to implement.

As an adjective antiadrenergic is

preventing or counteracting the effects of adrenaline.

As a noun adrenaline

is an alternative name for epinephrine; the hormone and neurotransmitter.

As an adjective antiadrenergic is

preventing or counteracting the effects of adrenaline.

In organic chemistry terms the difference between functionalize and unfunctionalized

is that functionalize is to add a functional group to a compound while unfunctionalized is not functionalized.

As a verb functionalize

is to provide something with a function.

As an adjective unfunctionalized is

not functionalized.

As a proper noun tan

is the eighth heavenly stem.

As a verb overtan is

(intransitive) to tan to too great a degree.

As an adjective prehistoric

is of relating to the epoch before written record.

As a noun apeman is

a prehistoric man resembling an ape.

As adjectives the difference between permed and unpermed

is that permed is that has been given a permanent wave while unpermed is not permed.

As a verb permed

is (perm).

As an adjective copresent

is present along with others.

As a verb copresent

is to present along with others.

As a noun copresenter is

one who copresents; one who presents something, especially a public event, together with other presenters.

As nouns the difference between relaxant and hydralazine

is that relaxant is something which promotes relaxation while hydralazine is a direct-acting smooth muscle relaxant used to treat hypertension by acting as a vasodilator primarily in arteries and arterioles.