ravelin

As nouns the difference between ravelin and raveling

is that ravelin is a fortification outside a castle used to split an attacking force; composed of two faces, forming a salient angle whose gorge resembles a half-moon while raveling is an alternative form of lang=en.

As a verb raveling is

present participle of lang=en.

As nouns the difference between javelin and ravelin

is that javelin is a light spear thrown with the hand and used as a weapon while ravelin is a fortification outside a castle used to split an attacking force; composed of two faces, forming a salient angle whose gorge resembles a half-moon.

As a verb javelin

is to pierce with a javelin.

As nouns the difference between ravelin and hornwork

is that ravelin is a fortification outside a castle used to split an attacking force; composed of two faces, forming a salient angle whose gorge resembles a half-moon while hornwork is 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.

As nouns the difference between ravelin and demilune

is that ravelin is a fortification outside a castle used to split an attacking force; composed of two faces, forming a salient angle whose gorge resembles a half-moon while demilune is a fortification constructed beyond the main ditch of a fortress, and in front of the curtain between two bastions, intended to defend the curtain; a ravelin.

As an adjective demilune is

in the shape of a half-moon, i.e. semicircular.