narrowness vs breadth

narrowness and breadth both are nouns.

Word	Noun	Adjective	Verb	Adverb
narrowness	Yes	No	No	No
breadth	Yes	No	No	No

As nouns, breadth is a hypernym of narrowness; that is, breadth is a word with a broader meaning than narrowness:

Other hypernyms of narrowness include width.

narrowness (noun)	breadth (noun)
the property of being narrow; having little width	the extent of something from side to side
a small margin	the capacity to understand a broad range of topics
an inclination to criticize opposing opinions or shocking behavior
a restriction of range or scope