Adjective
1. acerb
2. acerbic, acrid, bitter, blistering, caustic, sulfurous, sulphurous, venomous, virulent, vitriolic, unpleasant, acidic
Noun
1. compound
2. chemical compound, back breaker
2. battery-acid, dose, dot, Elvis, loony toons, Lucy in the sky with diamonds, pane, superman, window pane, Zen, lysergic acid diethylamide, LSD