machicolation vs breastwork

machicolation and breastwork both are nouns.

Word	Noun	Adjective	Verb	Adverb
machicolation	Yes	No	No	No
breastwork	Yes	No	No	No

As nouns, breastwork is a hypernym of machicolation; that is, breastwork is a word with a broader meaning than machicolation:

machicolation: a projecting parapet supported by corbels on a medieval castle; has openings through which stones or boiling water could be dropped on an enemy
breastwork: fortification consisting of a low wall

Other hypernyms of machicolation include parapet.

machicolation (noun)	breastwork (noun)
a projecting parapet supported by corbels on a medieval castle; has openings through which stones or boiling water could be dropped on an enemy	fortification consisting of a low wall