The difference between Quicken and Quickens

When used as nouns, quicken means the european rowan, sorbus aucuparia, whereas quickens means a weed, quitch.

Quicken is also verb with the meaning: to give life to.

check bellow for the other definitions of Quicken and Quickens

Quicken as a verb (transitive, now, _, literary):

To give life to; to animate, make alive, revive.
Quicken as a verb (intransitive, now, _, literary):

To come back to life, receive life.
Quicken as a verb (intransitive):

To take on a state of activity or vigour comparable to life; to be roused, excited.
Quicken as a verb (intransitive):

Of a pregnant woman: to first feel the movements of the foetus, or reach the stage of pregnancy at which this takes place; of a foetus: to begin to move.
Quicken as a verb (transitive):

To make quicker; to hasten, speed up.
Quicken as a verb (intransitive):

To become faster.

Examples:

"My heartbeat quickened when I heard him approach."
Quicken as a verb (shipbuilding):

To shorten the radius of (a curve); to make (a curve) sharper.

Examples:

"to quicken the sheer, that is, to make its curve more pronounced"

Quicken as a noun (now, _, chiefly, Northern England):

The European rowan, Sorbus aucuparia.