What is the difference between a rain tree and a frakincense tree?

Rain tree also called monkeypod, a large leguminous tropical tree ( Albizia saman or Samanea saman ) of tropical America belonging to the family Leguminosae ( pulse family). Boswellia or Frankincense trees are small and often shrub like perennials, they may grow anywhere from 2-8 meters tall.