castellated vs battlemented

castellated and battlemented both are adjectives.

Word	Noun	Adjective	Verb	Adverb
castellated	No	Yes	No	No
battlemented	No	Yes	No	No

As adjectives, castellated and battlemented are synonyms defined as:

castellated and battlemented: having or resembling repeated square indentations like those in a battlement

Other synonyms of castellated include castled, crenelated, embattled.

castellated (adjective)	battlemented (adjective)
having or resembling repeated square indentations like those in a battlement	having or resembling repeated square indentations like those in a battlement
	protected with battlements or parapets with indentations or embrasures for shooting through