fort vs crenellation

fort and crenellation both are nouns.

Word	Noun	Adjective	Verb	Adverb
fort	Yes	No	Yes	No
crenellation	Yes	No	No	No

fort (noun)	crenellation (noun)
a fortified defensive structure	the action of constructing ramparts with gaps for firing guns or arrows
a fortified military post where troops are stationed	a rampart built around the top of a castle with regular gaps for firing arrows or guns

fort (verb)	crenellation (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