half-bastion vs demi-bastion

half-bastion and demi-bastion both are nouns.

Word	Noun	Adjective	Verb	Adverb
half-bastion	Yes	No	No	No
demi-bastion	Yes	No	No	No

As nouns, half-bastion and demi-bastion are synonyms defined as:

half-bastion and demi-bastion: in military architecture, a bastion constructed of one face, and one flank.

half-bastion (noun)	demi-bastion (noun)
in military architecture, a bastion constructed of one face, and one flank.	in military architecture, a bastion constructed of one face, and one flank.