separate off vs zone

separate off is not a noun while zone is a noun.

Word	Noun	Adjective	Verb	Adverb
separate off	No	No	Yes	No
zone	Yes	No	Yes	No

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

Other hypernyms of separate off include partition.

separate off (noun)	zone (noun)
	(anatomy) any encircling or beltlike structure
	a locally circumscribed place characterized by some distinctive features
	an area or region distinguished from adjacent parts by a distinctive feature or characteristic
	any of the regions of the surface of the Earth loosely divided according to latitude or longitude

separate off (verb)	zone (verb)
partition by means of a divider, such as a screen	separate or apportion into sections
	regulate housing in; of certain areas of towns