crenellation vs rampart

crenellation and rampart both are nouns.

Word	Noun	Adjective	Verb	Adverb
crenellation	Yes	No	No	No
rampart	Yes	No	No	No

As nouns, rampart is a hypernym of crenellation; that is, rampart is a word with a broader meaning than crenellation:

crenellation: a rampart built around the top of a castle with regular gaps for firing arrows or guns
rampart: an embankment built around a space for defensive purposes

Other hypernyms of crenellation include bulwark, wall.

crenellation (noun)	rampart (noun)
the action of constructing ramparts with gaps for firing guns or arrows	an embankment built around a space for defensive purposes
a rampart built around the top of a castle with regular gaps for firing arrows or guns