fortification vs bulwark

fortification and bulwark both are nouns.

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

fortification (noun)	bulwark (noun)
the addition of an ingredient for the purpose of enrichment (as the addition of alcohol to wine or the addition of vitamins to food)	a protective structure of stone or concrete; extends from shore into the water to prevent a beach from washing away
defensive structure consisting of walls or mounds built around a stronghold to strengthen it	an embankment built around a space for defensive purposes
the art or science of strengthening defenses	a fencelike structure around a deck

fortification (verb)	bulwark (verb)
	defend with a bulwark