solid bastion vs crownwork

solid bastion and crownwork both are nouns.

Word	Noun	Adjective	Verb	Adverb
solid bastion	Yes	No	No	No
crownwork	Yes	No	No	No

solid bastion (noun)	crownwork (noun)
a bastion that is filled up entirely, and has the ground even with the height of the rampart, without any empty space towards the center.	(dentistry) dental appliance consisting of an artificial crown for a broken or decayed tooth
	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.