noun (n)

• tree (as opposed to shrub)(noun.plant)

  source: wordnet30
• any of various rotating shafts that serve as axes for larger rotating parts(noun.artifact)

  Synonym:
  mandrel, mandril, spindle
  

  source: wordnet30
• a framework that supports climbing plants(noun.artifact)

  Example:
  The arbor provided a shady resting place in the park.
  

  Synonym:
  arbour, bower, pergola
  

  source: wordnet30
• A kind of latticework formed of, or covered with, vines, branches of trees, or other plants, for shade; a bower.(noun)

  source: webster1913
• A tree, as distinguished from a shrub.(noun)

  source: webster1913