crenelation vs battlement

crenelation and battlement both are nouns.

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

As nouns, crenelation and battlement are synonyms defined as:

crenelation and battlement: a rampart built around the top of a castle with regular gaps for firing arrows or guns

Other synonyms of crenelation include crenellation.

crenelation (noun)	battlement (noun)
the action of constructing ramparts with gaps for firing guns or arrows	a rampart built around the top of a castle with regular gaps for firing arrows or guns
a rampart built around the top of a castle with regular gaps for firing arrows or guns