bulwark vs bailey

bulwark and bailey both are nouns.

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

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

bulwark: 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 bulwark include battlement, crenelation, crenellation, earthwork, fraise, merlon.

bulwark (noun)	bailey (noun)
a protective structure of stone or concrete; extends from shore into the water to prevent a beach from washing away	the outer defensive wall that surrounds the outer courtyard of a castle
an embankment built around a space for defensive purposes	the outer courtyard of a castle
a fencelike structure around a deck

bulwark (verb)	bailey (verb)
defend with a bulwark