添乗 （テンジョウ） accompanying (on a trip), escorting (a tour group)

添加物 （テンカブツ） additive

水添 （スイテン） hydrogenation

別添 （ベッテン） attachment, annexation, addendum, appendix

添える （そえる） to garnish, to accompany (as a card does a gift), to add to as support, to prop up, to accompany (as an aid, guide, translator, etc.), to mimic, to imitate, to draw something near to oneself, to approach nearby

添う （そう） to meet (wishes, expectations, etc.), to satisfy, to comply with, to live up to, to accompany, to go with, to stay by one's side, to associate with (someone), to mix with, to marry, to wed, to be added

添水 （そうず） water-filled bamboo tube in Japanese garden which clacks against a stone when emptied