Flaw
Part of speech: noun
Definition: A crack or breach, a gap or fissure; a defect of continuity or cohesion. A defect, fault, or imperfection, especially one that is hidden. A defect or error in a contract or other document which may make the document invalid. A sudden burst or gust of wind of short duration. A storm of short duration. A sudden burst of noise and disorder; a tumult; uproar; a quarrel.
Part of speech: verb
Definition: To add a flaw to, to make imperfect or defective. To become imperfect or defective.
Example sentence: The fundamental flaw in Social Security and Medicare is that they violate the 'welfare principle' in economics. The welfare principle forms the fundamental basis of all charitable work in churches and other private organizations: assist those who need help, and equally important, don't assist individuals who can take care of themselves.
Defect
Part of speech: noun
Definition: A fault or malfunction.
Part of speech: verb
Definition: To abandon or turn against; to cease or change one's loyalty.
Example sentence: Only in Britain could it be thought a defect to be too clever by half. The probability is that too many people are too stupid by three-quarters.