What's the difference between againsay and gainsay?

Againsay

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Definition:

• (v. t.) To gainsay.

Example Sentences:

Gainsay

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Definition:

• (v. t.) To contradict; to deny; to controvert; to dispute; to forbid.

Example Sentences:

• (1) It responded to all who predicted the chaos now engulfing us like an unscrupulous pundit who knows that his living depends on shutting up the experts who gainsay him.
• (2) Azerbaijan As yet a non-aligned Eurovision nation Who would gainsay the chances of the plucky Azeris, who have only been in Eurovision for two years and so are relative innocents in this grubby pseudo-musical farce?
• (3) It was impossible to gainsay David Moyes, when he insisted: "It wasn't even a free-kick."
• (4) For Israel, he was the unregenerate terrorist; and Washington would not gainsay its protege.
• (5) And that means gainsaying the administration’s hesitant Syria policy and throwing credit to the McCains, Kings and Grahams who said that we should have been arming those rebels all along.