WordNet sense 1 (an imperfection in a device or machine):

defect, flaw, defect

WordNet sense 2 ((geology) a crack in the earth's crust resulting from the displacement of one side with respect to the other):

break, fracture, shift, faulting, geological fault

WordNet sense 3 (the quality of being inadequate or falling short of perfection):

demerit

WordNet sense 4 (put or pin the blame on):

blame

WordNet sense 5 (a wrong action attributable to bad judgment or ignorance or inattention):

error, mistake