breadth vs broadness

breadth and broadness both are nouns.

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

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

Other hyponyms of breadth include wideness, beam, narrowness.

breadth (noun)	broadness (noun)
the extent of something from side to side	the property of being wide; having great width
the capacity to understand a broad range of topics