spall vs fragment

spall and fragment both are nouns.

Word	Noun	Adjective	Verb	Adverb
spall	Yes	No	No	No
fragment	Yes	No	Yes	No

As nouns, fragment is a hypernym of spall; that is, fragment is a word with a broader meaning than spall:

spall: a fragment broken off from the edge or face of stone or ore and having at least one thin edge
fragment: a piece broken off or cut off of something else

spall (noun)	fragment (noun)
a fragment broken off from the edge or face of stone or ore and having at least one thin edge	a broken piece of a brittle artifact
	an incomplete piece
	a piece broken off or cut off of something else

spall (verb)	fragment (verb)
	break or cause to break into pieces