dullness vs bluntness

dullness and bluntness both are nouns.

Word	Noun	Adjective	Verb	Adverb
dullness	Yes	No	No	No
bluntness	Yes	No	No	No

As nouns, dullness and bluntness are synonyms defined as:

dullness (noun)	bluntness (noun)
lack of sensibility	without sharpness or clearness of edge or point
without sharpness or clearness of edge or point	the quality of being direct and outspoken
the quality of lacking interestingness
a lack of visual brightness
the quality of being slow to understand