fort vs defensive structure

fort and defensive structure both are nouns.

Word	Noun	Adjective	Verb	Adverb
fort	Yes	No	Yes	No
defensive structure	Yes	No	No	No

As nouns, defensive structure is a hypernym of fort; that is, defensive structure is a word with a broader meaning than fort:

Other hypernyms of fort include defence, defense.

fort (noun)	defensive structure (noun)
a fortified defensive structure	a structure used to defend against attack
a fortified military post where troops are stationed

fort (verb)	defensive structure (verb)
station (troops) in a fort
enclose by or as if by a fortification
gather in, or as if in, a fort, as for protection or defense