soul mate

person with whom one has a deep lasting friendship and understanding 知己; 执友.

sorrowfulness, sorry, sorry-looking, sort, sort out, sort through, sorter, sortie, sorting, SOS, sot, sottish, sotto voce, sou, souffle, sough, sought, soul, soul brother (fem 阴性作 `soul sister), soul food, soul music, soul-destroying, soul-searching, soul-stirring, soulful, soulfully, soulfulness, soulless, soullessly, sound, sound a warning, sound archives, sound barrier (also sonic barrier), sound effect, sound-proof, sound-recording, sound-track, sound-wave, sounding, sounding-board,