rail off vs divide

rail off is not a noun while divide is a noun.

Word	Noun	Adjective	Verb	Adverb
rail off	No	No	Yes	No
divide	Yes	No	Yes	No

As verbs, divide is a hypernym of rail off; that is, divide is a word with a broader meaning than rail off:

Other hypernyms of rail off include separate.

rail off (noun)	divide (noun)
	a ridge of land that separates two adjacent river systems
	a serious disagreement between two groups of people (typically producing tension or hostility)

rail off (verb)	divide (verb)
separate with a railing	perform a division
	move or break apart
	force, take, or pull apart
	make a division or separation
	separate into parts or portions
	act as a barrier between; stand between