acerb vs blistering

acerb is not a noun while blistering is a noun.

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

As adjectives, acerb and blistering are synonyms defined as:

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

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

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