What's the difference between unstep and unstop?

Unstep

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Definition:

• (v. t.) To remove, as a mast, from its step.

Example Sentences:

• (1) Two modes of tractor driving--by means of unstepped and frictional turn mechanisms--were compared.
• (2) The study revealed the advantage of unstepped turn mechanism according to changes of the body functional status.

Unstop

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Definition:

• (v. t.) To take the stopple or stopper from; as, to unstop a bottle or a cask.
• (v. t.) To free from any obstruction; to open.

Example Sentences: