| birch tree | 2.83 | ...the gnarled trunk of a birch tree. | ||
| birch bark | 0.66 | The clear sap flows into buckets made from folded birch bark. | ||
| birch branch | 0.26 | He smacked his legs with a birch branch. | ||
| birch plywood | 0.26 | On the other hand, I saw enough birch plywood to last me a couple of years. |