brickbat vs fragment

brickbat and fragment both are nouns.

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

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

brickbat (noun)	fragment (noun)
blunt criticism	a broken piece of a brittle artifact
a fragment of brick used as a weapon	an incomplete piece
	a piece broken off or cut off of something else

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