thickness vs broadness

thickness and broadness both are nouns.

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

As nouns, broadness is a hypernym of thickness; that is, broadness is a word with a broader meaning than thickness:

Other hypernyms of thickness include wideness.

thickness (noun)	broadness (noun)
the dimension through an object as opposed to its length or width	the property of being wide; having great width
resistance to flow
used of a line or mark
indistinct articulation