Blamer

blame  (blm)

tr.v. blamed, blam·ing, blames

1. To hold responsible.

2. To find fault with; censure.

3. To place responsibility for (something): blamed the crisis on poor planning.

n.

1. The state of being responsible for a fault or error; culpability.

2. Censure; condemnation.

Idiom:

to blame

1. Deserving censure; at fault.

2. Being the cause or source of something: A freak storm was to blame for the power outage.

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[Middle English blamen, from Old French blasmer, blamer, from Vulgar Latin *blastmre, alteration of Late Latin blasphmre, to reproach; see blaspheme.]

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blamer n.

Synonyms: blame, fault, guilt
These nouns denote a sense of responsibility for an offense. Blame stresses censure or punishment for a lapse or misdeed for which one is held accountable: The police laid the blame for the accident on the driver.
Fault is culpability for wrongdoing or failure: It is my own fault that I wasn't prepared for the exam.
Guilt applies to willful wrongdoing and stresses moral culpability: The prosecution had evidence of the defendant's guilt. See Also Synonyms at criticize.