The best replacement for stem is steam.

The best alternatives to stem are rated as following:
★★★★★  steam
★★★  root
★★★  stalk
★★★  liberal arts
★★  ib
★★  dicot stem
★★  trunk
★★  hydra
★★  stud
★★  humanities
★  priovr
★  tem
★  stemless wine glasses
★  short stem roses
★  woody stem
★  monocot stem
★  root ginger
★  non rising stem
★  floret
  lemma
  long stem
  stim
  chrome sleeve valve stem
  spinal cord
  non stem
  common core
  stemless bong
  monocot root
  rising stem
  aerial
  low stem
  human brain stem

Your alternative for stem is not listed? Suggest!
Speaking about stem, one probably shouldn't forget about crystal stones flutes.

Other search terms related to stem and their ratings are:
★★★★★ crystal stones flutes
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stem
steam
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