twig stick branch bough trunk

twig  細枝，嫩枝

:  a small shoot or branch usually without its leaves
:  a minute branch of a nerve or artery

He made a fire with dry twigs .  
他用乾樹枝生火。

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stick  枝條；柴枝

: a long thin piece of wood that has fallen
  or been cut from a tree

I bought the child some sticks of candy .  
我給孩子買了幾根棒棒

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branch  樹枝；支族；支流

: a part of a tree that grows out from the trunk
: a local office or shop of a company or organization
: a major part of a government

The tree near the house branched over the roof .  
屋旁那棵樹的分枝長到了屋頂上。

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bough  大樹枝

: a main branch of a tree

The window of her car was broken by a bough 
during last night ' s storm .
 在昨晚的風暴中她的車窗被一根大樹枝打破了。

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trunk  樹幹

: the thick main stem of a tree
: the main part of the human body not
   including the head, arms, and legs
: the main or central part of something

The trunk of this tree is four meters thick .  
這棵樹的樹幹有四米粗。

Let me put your baggage in the trunk .  
我來把你的行李放在汽車後部的行李箱內。

The athlete has a powerful trunk .  
那個運動員身軀強壯有力

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twig < stick < branch < bough < trunk