Cases of word usage

1) (the wood of) a kind of forest tree with a smooth bark and thin branches (birch)

2) an imitation of a dog's bark (bow-wow)

3) a yellowish-brown spice from the inner bark of an E Indian Tree, used in cooking (cinnamon)

4) the light, brown, tough outer bark of a kind of tree (called the cork-oak) (cork)

5) a tough, elastic substance made from the milky liquid that flows from certain trees when the bark is cut, used for making tyres etc (rubber)

6) (especially of dogs) (to make) a short, sharp bark (yap)