The best replacement for tree is shrub.

The best alternatives to tree are rated as following:
★★★★★  shrub
★★★  holiday tree
★★★  bush
★★  three
★★  graph
★★  plant
★  heap
★  artificial
★  christmas tree
★  coconut tree
★  trie
★  hash
★  palmetto tree
★  cladogram
★  quicken loans
★  dollar general
★  weed
★  birch tree
★  child domain
  rpart
  eloan
  hashmap
  dag
  artificial tree
  linked list
  directed acyclic graph
  fake
  binary tree
  real christmas tree
  pico
  magnolia tree
  vine
  palm tree
  rose of sharon tree
  hashtable
  family dollar
  flower
  maple tree
  mossy oak
  thundercloud tree
  decision table
  spanning tree
  fir tree
  flow chart
  graph search
  dove tree
  cross
  opeth
  palmetto
  fake tree

Your alternative for tree is not listed? Suggest!
Speaking about tree, one probably shouldn't forget about roots.

Other search terms related to tree and their ratings are:
★★★★★ roots
★★★ bark
★★ deep roots
★ background
red berries in winter
You have in mind a companion for tree and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of tree in all years. Click on graph for more.
tree
shrub
holiday tree