using the right word - dismantle or disassembling a fitted object

I am confused about using dismantling and disassembling when it comes to furniture like door or chair. Can we say we dismantle a door or disassemble a door or simply broke them apart,pull it out or something else?
Machines are usually dismantled. A fitted thing is not dismantled or disassembled?

Example

if the door itself was broken into smaller pieces, can we use any one word or should we use words like broken into or taken apart.For example a child may ask – can the fitted pieces of wood be taken apart or pulled out to be used again – although it may not be possible – how will I explain it to him?