callous vs callosity

callous is not a noun while callosity is a noun.

Word	Noun	Adjective	Verb	Adverb
callous	No	Yes	Yes	No
callosity	Yes	No	No	No

callous (noun)	callosity (noun)
	devoid of passion or feeling; hardheartedness
	an area of skin that is thick or hard from continual pressure or friction (as the sole of the foot)

callous (adjective)	callosity (adjective)
emotionally hardened
having calluses; having skin made tough and thick through wear

callous (verb)	callosity (verb)
make insensitive or callous; deaden feelings or morals