A defect is something wrong with something, that stops it from being perfect. A defect in a machine might stop it from working at all.
A defect might also be called a flaw or imperfection.
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A deity is a divine creature that is worshipped as part of a religion. Deities are usually ascribed special powers.
Something is delicate if it has fine detail, or is fragile. A color or flavor is delicate if there is only the barest hint of it.
You demolish something when you take it apart until there is nothing left.
When you say demolish, you usually mean a building being demolished.