sharpness vs painfulness

sharpness and painfulness both are nouns.

Word	Noun	Adjective	Verb	Adverb
sharpness	Yes	No	No	No
painfulness	Yes	No	No	No

As nouns, painfulness is a hypernym of sharpness; that is, painfulness is a word with a broader meaning than sharpness:

Other hypernyms of sharpness include distressingness.

sharpness (noun)	painfulness (noun)
harshness of manner	the quality of being painful
thinness of edge or fineness of point	emotional distress; a fundamental feeling that people try to avoid
a strong odor or taste property
the quality of being sharp and clear
the attribute of urgency in tone of voice
the quality of being keenly and painfully felt
a quick and penetrating intelligence