clavus vs callosity

clavus and callosity both are nouns.

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

As nouns, callosity is a hypernym of clavus; that is, callosity is a word with a broader meaning than clavus:

clavus: a hard thickening of the skin (especially on the top or sides of the toes) caused by the pressure of ill-fitting shoes
callosity: an area of skin that is thick or hard from continual pressure or friction (as the sole of the foot)

Other hypernyms of clavus include callus.

clavus (noun)	callosity (noun)
a hard thickening of the skin (especially on the top or sides of the toes) caused by the pressure of ill-fitting shoes	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)