acerb vs virulent

acerb and virulent both are adjectives.

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

As adjectives, acerb and virulent are synonyms defined as:

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

acerb (adjective)	virulent (adjective)
sour or bitter in taste	infectious; having the ability to cause disease
harsh or corrosive in tone	extremely poisonous or injurious; producing venom
	harsh or corrosive in tone