zone vs zonula

zone and zonula both are nouns.

Word	Noun	Adjective	Verb	Adverb
zone	Yes	No	Yes	No
zonula	Yes	No	No	No

As nouns, zonula is a hyponym of zone; that is, zonula is a word with a more specific, narrower meaning than zone:

Other hyponyms of zone include zona pellucida, zonule.

zone (noun)	zonula (noun)
(anatomy) any encircling or beltlike structure	small beltlike zone
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

zone (verb)	zonula (verb)
separate or apportion into sections
regulate housing in; of certain areas of towns