different between crownwork vs hornwork

English

crown +? work

crownwork (plural crownworks)

A type of fortification, like a hornwork, but consisting of a full bastion with the walls on either side ending in half-bastions from which longer flank walls run back towards the main fortress.
(dentistry) The addition of a crown.

horn +? work

hornwork (plural hornworks)

A type of fortification consisting of a pair of demi-bastions with a curtain wall connecting them and with two long sides directed upon the faces of the bastions, or ravelins of the inner fortifications, so as to be defended by them.

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