What's the difference between footstalk and footstall?

Footstalk

Definition:

• (n.) The stalk of a leaf or of flower; a petiole, pedicel, or reduncle.
• (n.) The peduncle or stem by which various marine animals are attached, as certain brachiopods and goose barnacles.
• (n.) The stem which supports which supports the eye in decapod Crustacea; eyestalk.
• (n.) The lower part of a millstone spindle. It rests in a step.

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Footstall

Definition:

• (n.) The stirrup of a woman's saddle.
• (n.) The plinth or base of a pillar.

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