605. What characters can be added here so that each character contains a part of the previous character? 炎 -> _ -> _ -> 腰

Answer:

炎  EN, honou - flame

腰  YOU, koshi - pelvis, loins, hips, back

炎 -> 畑 -> 胃 -> 腰

畑  hatake - cultivated field

胃  I - stomach