flaw as in an imperfection in an object or machine
"a flaw caused the crystal to shatter"
"if there are any defects you should send it back to the manufacturer"
defect desert (a cause, a country or an army), often in order to join the opposing cause, country, or army; an imperfection in a bodily system; a failing or deficiency; an imperfection in an object or machine; a mark or flaw that spoils the appearance of something (especially on a person's body)
fault put or pin the blame on ; a wrong action attributable to bad judgment or ignorance or inattention; an imperfection in an object or machine; the quality of being inadequate or falling short of perfection; (geology) a crack in the earth's crust resulting from the displacement of one side with respect to the other; (electronics) equipment failure attributable to some defect in a circuit (loose connection or insulation failure or short circuit etc.); responsibility for a bad situation or event; (sports) a serve that is illegal (e.g., that lands outside the prescribed area)
flaw as in defect or weakness in a person's character
"he had his flaws, but he was great nonetheless"
flaw as in an imperfection in a plan or theory or legal document that causes it to fail or that reduces its effectiveness