brickbat vs criticism

brickbat and criticism both are nouns.

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

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

Other hypernyms of brickbat include unfavorable judgment.

brickbat (noun)	criticism (noun)
blunt criticism	a serious examination and judgment of something
a fragment of brick used as a weapon	disapproval expressed by pointing out faults or shortcomings
	a written evaluation of a work of literature