blistering vs acerb

blistering is a noun but acerb is not a noun.

Word	Noun	Adjective	Verb	Adverb
blistering	Yes	Yes	No	No
acerb	No	Yes	No	No

As adjectives, blistering and acerb are synonyms defined as:

Other synonyms of blistering include acerbic, acid, acrid, bitter, caustic, sulfurous, sulphurous, virulent, vitriolic.

blistering (noun)	acerb (noun)
the formation of vesicles in or beneath the skin

blistering (adjective)	acerb (adjective)
very fast; capable of quick response and great speed	sour or bitter in taste
hot enough to raise (or as if to raise) blisters	harsh or corrosive in tone
harsh or corrosive in tone