rampart vs bailey

rampart and bailey both are nouns.

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

As nouns, bailey is a hyponym of rampart; that is, bailey is a word with a more specific, narrower meaning than rampart:

rampart: an embankment built around a space for defensive purposes
bailey: the outer defensive wall that surrounds the outer courtyard of a castle

Other hyponyms of rampart include battlement, crenelation, crenellation, earthwork, fraise, merlon.

rampart (noun)	bailey (noun)
an embankment built around a space for defensive purposes	the outer defensive wall that surrounds the outer courtyard of a castle
	the outer courtyard of a castle