Tree with O

• Orange tree

  A real fruit tree; orange trees are common.

• oak tree

  Classic tree; oak trees grow in many places.

• Oak

  Oak is a well-known, sturdy tree.

• Olive tree

  Yes, an olive tree is a real fruit tree.

• Olive

  Olive tree, famous Mediterranean fruit tree.

• Orchid tree

  Orchid tree is a real ornamental tree species.

• Onion tree

  Common name for Moringa ovalifolia, a real tree

The words in the list Tree with O come from players of the word game City, Country, River.