battlement vs rampart

battlement and rampart both are nouns.

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

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

battlement: 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 battlement include bulwark, wall.

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