Acerb is a 5 letter English word. It's valid Scrabble word worth 9 points. It's valid Words with friends word worth 11 points.
You can make 71 anagrams from letters in acerb (abcer).
1650-60; Latin acerbus; see acerbic
She denied that stenographers could ever form a union, but she could not answer his acerb, “Why not?”