What's the difference between herse and hyrse?

Herse

Definition:

(n.) A kind of gate or portcullis, having iron bars, like a harrow, studded with iron spikes. It is hung above gateways so that it may be quickly lowered, to impede the advance of an enemy.
(n.) See Hearse, a carriage for the dead.
(n.) A funeral ceremonial.
(v. t.) Same as Hearse, v. t.

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Definition:

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